Update GitHub Action Swatinem/rust-cache to v2.9.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
Swatinem/rust-cache	action	minor	v2.8.2 → v2.9.1

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Release Notes

Swatinem/rust-cache (Swatinem/rust-cache)

v2.9.1

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Fix regression in hash calculation

Full Changelog: Swatinem/rust-cache@v2.9.0...v2.9.1

v2.9.0

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What's Changed

• Add support for running rust-cache commands from within a Nix shell by @​marc0246 in #​290
• Bump taiki-e/install-action from 2.62.57 to 2.62.60 in the actions group by @​dependabot[bot] in #​291
• Bump the actions group across 1 directory with 5 updates by @​dependabot[bot] in #​296
• Bump the prd-major group with 3 updates by @​dependabot[bot] in #​294
• Bump @​types/node from 24.10.1 to 25.0.2 in the dev-major group by @​dependabot[bot] in #​295
• Consider all installed toolchains in cache key by @​tamird in #​293
• Compare case-insenitively for full cache key match by @​kbriggs in #​303
• Migrate to node24 runner by @​rhysd in #​314
• Bump the actions group across 1 directory with 7 updates by @​dependabot[bot] in #​312
• Bump the prd-minor group across 1 directory with 2 updates by @​dependabot[bot] in #​307
• Bump @​types/node from 25.0.2 to 25.2.2 in the dev-minor group by @​dependabot[bot] in #​309

New Contributors

• @​marc0246 made their first contribution in #​290
• @​tamird made their first contribution in #​293
• @​kbriggs made their first contribution in #​303

Full Changelog: Swatinem/rust-cache@v2.8.2...v2.9.0

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PR Summary

Low Risk
Low risk CI-only change that updates a third-party caching action; impact is limited to workflow cache behavior and CI performance/stability.

Overview
Updates .github/workflows/rust.yml to bump Swatinem/rust-cache from v2.8.2 to v2.9.1 in both the lint and test jobs (no other workflow logic changes).

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[augmentcode]

🤖 Augment PR Summary

Summary: Updates the Rust CI workflow to use Swatinem/rust-cache v2.9.1 (pinned by commit SHA) instead of v2.8.2.
Why: Incorporates upstream fixes/improvements (notably the hash calculation regression fix) while preserving existing caching configuration.

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