deps: bump vgi from 0.17.0 to 0.20.0

[dependabot]

Bumps vgi from 0.17.0 to 0.20.0.

Release notes

Sourced from vgi's releases.

v0.20.0

Port of the vgi-python 0.16 delta. Aligns the Rust SDK with vgi-python 0.16.0 and the vgi C++ extension. Integration suite green on subprocess, launcher (AF_UNIX), and HTTP lanes across ubuntu/macos/windows.

• Blended ("UNNEST-style") table-in-out: FunctionMetadata::input_from_args + registration-time guards, arity/varargs overload resolution; fixtures geo_encode, row_sum, blended_drop, projectable_blended, hostile_provenance.
• Per-output-row provenance for batched correlated LATERAL: EmitOptions.parent_rows + blended_explode fixture.
• substream_id + parallel-finalize: InitRequest.substream_id, parallel per-substream finalize; distributed sum migrated to buffered.
• Result-cache surfaces: TableInOutFunction::process_out with EmitOptions (metadata, cache_control, parent_rows), buffered-finalize cache-control, scalar cache_control() (CACHE_CONTROL), conditional-revalidation validators; cached_* fixtures.
• deps: vgi-rpc 0.13.0 from crates.io (shm request-batch routing, HTTP first-tick init metadata, wasm-buildable shm) — the local-checkout [patch.crates-io] is gone.

Commits

• 2b5b31b release: bump 0.19.0 -> 0.20.0 — vgi-python 0.16 delta (blended, provenance, ...
• 1d46c67 build(deps): vgi-rpc 0.13.0 from crates.io; drop the local-checkout patch
• 05e65d1 fix(ci): track vgi's vgi-rpc 0.12 dep in doc-examples (mirror the workspace p...
• 3b6a266 feat(scalar): result-cache opt-in for scalar functions + cacheable fixtures
• 1ac8511 feat(exchange): surface conditional-revalidation validators + revalidating fi...
• 9f8a101 feat(cache): cache-control in table-in-out + buffered-finalize emits; cacheab...
• b8597c2 feat(blended): per-output-row provenance for batched correlated LATERAL
• 8c88863 test(blended): BlendedDropFunction 1->0 edge-case fixture
• 53c456e feat(table-in-out): blended (input_from_args) worker support + arity/varargs ...
• e8bb911 feat(table-in-out): substream_id + parallel-finalize support; migrate distrib...
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