Bump the deps group across 2 directories with 2 updates

[dependabot]

Bumps the deps group with 1 update in the /ci/tox/build-context directory: tox.
Bumps the deps group with 1 update in the /requirements directory: mypy.

Updates tox from 4.56.1 to 4.56.4

Release notes

Sourced from tox's releases.

v4.56.4

What's Changed

• 🐛 fix(discovery): find debug interpreters like python3.13-dbg by @​gaborbernat in tox-dev/tox#3978

Full Changelog: tox-dev/tox@4.56.3...4.56.4

v4.56.3

What's Changed

• Don't double-close the child pty fd (fixes parallel Bad file descriptor) (#3975) by @​apoorvdarshan in tox-dev/tox#3976

New Contributors

• @​apoorvdarshan made their first contribution in tox-dev/tox#3976

Full Changelog: tox-dev/tox@4.56.2...4.56.3

v4.56.2

What's Changed

• 🔧 chore(type): drop stale ty invalid-assignment ignores by @​gaborbernat in tox-dev/tox#3970
• Fix 17 bugs found in a deep codebase sweep by @​gaborbernat in tox-dev/tox#3974

Full Changelog: tox-dev/tox@4.56.1...4.56.2

Changelog

Sourced from tox's changelog.

Bug fixes - 4.56.4

• Discover debug (Py_DEBUG) interpreters set as base_python, such as Debian's python3.13-dbg - the spec was misread as a machine named dbg and no interpreter matched. Requires python-discovery>=1.4.4 - by :user:gaborbernat. (:issue:3977)

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v4.56.3 (2026-07-08)

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Bug fixes - 4.56.3

• Stop double-closing the child pty file descriptor when running under a tty, which could race a parallel run that had reused the freed descriptor number and cause intermittent Bad file descriptor/Input/output error failures - by :user:apoorvdarshan. (:issue:3975)

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v4.56.2 (2026-07-07)

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Bug fixes - 4.56.2

• Fix a batch of latent defects found in a codebase audit:

  • stop duplicating --extra-index-url when a merged requirements line repeats an already-seen index;
  • render --no-binary/--only-binary as comma-joined strings instead of leaking the internal set into the pip command line;
  • report a clear error instead of IndexError for a bare one-argument flag (-c, -r, -f, -e) in deps or constraints;
  • canonicalize optional-dependencies keys and self-referential (recursive) extra names so non-canonical spellings no longer silently drop dependencies;
  • raise a clear error instead of KeyError when dependency_groups is requested without a [dependency-groups] table;
  • stop a native TOML { replace = "env" } reference from leaking its resolution chain into sibling list entries and tripping a spurious circular chain error;
  • expand the range that actually matched in a factor expression rather than the first identical digit-range substring;
  • strip the backslash from an escaped \; in set_env values;
  • skip option values during command auto-detection so an environment named like a subcommand (e.g. tox -e list) is no longer misread;
  • treat an empty list-typed environment variable (e.g. TOX_DISCOVER=) as an empty list rather than [""];
  • report an environment whose name is an empty string as present in Config membership tests;
  • fail evaluation gracefully instead of crashing the driver thread when tox p -p all is run with an empty selection;
  • avoid rebuilding a throwaway PEP 517 frontend against the previous root when a package environment's root is reassigned before a frontend exists;
  • avoid crashing create_session_view when the package and its session copy share no common path (e.g. different Windows drives);

... (truncated)

Commits

• a44a942 release 4.56.4
• 7790501 🐛 fix(discovery): find debug interpreters like python3.13-dbg (#3978)
• 4dac7fe release 4.56.3
• 6f8dabc Don't double-close the child pty fd (fixes parallel Bad file descriptor) (#39...
• 5458a28 release 4.56.2
• d3dc2d1 Fix 17 bugs found in a deep codebase sweep (#3974)
• b55fe2f [pre-commit.ci] pre-commit autoupdate (#3973)
• 7ba0f81 💰 Surface GitHub Sponsors + thanks.dev
• 03c2d58 build(deps): bump actions/cache from 5.0.5 to 6.1.0 (#3972)
• 34962f1 [pre-commit.ci] pre-commit autoupdate (#3971)
• Additional commits viewable in compare view

Updates mypy from 2.1.0 to 2.2.0

Changelog

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Packaging changes

• No longer provide mypyc-accelerated wheels for macOS x86_64 [mypyc-wheels #119](mypyc/mypy_mypyc-wheels#119)

Mypy 2.3

We've just uploaded mypy 2.3.0 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release on Read the Docs.

The Upcoming Switch to the New Native Parser

We are planning to enable the new native parser (--native-parser) by default soon. We recommend that you test the native parser in your projects and report any issues in the mypy issue tracker.

Mypyc Free-threading Memory Safety

Free-threaded Python builds that don't have the GIL require additional synchronization primitives or lock-free algorithms to ensure memory safety when there are race conditions (for example, when a thread reads a list item while another thread writes the same list item concurrently). This release greatly improves memory safety of free threading.

List operations are now memory-safe on free threaded Python builds, even in the presence of race conditions. This has some performance cost. For list-heavy workloads, using librt.vecs.vec instead of list is often significantly faster, but note that vec is not (and likely won't be) fully memory safe, and the user is expected to avoid race conditions. The newly introduced librt.threading.Lock helps with this. Using variable-length tuples can also be more efficient than lists, since tuples are immutable and don't require expensive synchronization to ensure memory safety.

Instance attribute access is also (mostly) memory safe now on free-threaded builds in the presence of race conditions. We are planning to fix the remaining unsafe cases in a future release.

Full list of changes:

• Make attribute access memory safe on free-threaded builds (Jukka Lehtosalo, PR 21705)
• Fix unsafe borrowing of instance attributes with free-threading (Jukka Lehtosalo, PR 21688)
• Make list get/set item more memory safe on free-threaded builds (Jukka Lehtosalo, PR 21683)
• Don't borrow list items on free-threaded builds (Jukka Lehtosalo, PR 21679)
• Make multiple assignment from list memory-safe on free-threaded builds (Jukka Lehtosalo, PR 21684)

... (truncated)

Commits

• b3c4a5b Mark release
• 396f508 [Chore] Update changelog for 2.2 (#21691)
• 9592a9e Upload wasm wheels to PyPI (#21671)
• 1dc6962 Bump ast-serialize to 0.6.0 (#21664)
• 96a7913 Bump librt to 0.12.0 (#21663)
• 5ef0902 Fix the exportjson tool (.ff cache to .json conversion) (#21628)
• 8d621ad Support --shadow-file with --native-parser (#21623)
• 74ecdd8 Sync typeshed (#21612)
• 0cd1541 [mypyc] Make function wrappers thread-safe on free-threaded builds (#21620)
• 22a9cfd [mypyc] Make list remove and index thread-safe on free-threaded builds (#21614)
• Additional commits viewable in compare view

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