Fix unpinned action

[leynos]

Summary

• pin dtolnay/rust-toolchain action to immutable commit

Testing

• cargo fmt --all -- --check
• cargo clippy --all-targets --all-features -- -D warnings
• RUSTFLAGS="-D warnings" cargo test
• markdownlint docs/*.md README.md CHANGELOG.md
• nixie docs/*.md README.md CHANGELOG.md

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https://chatgpt.com/codex/tasks/task_e_684f5071faf48322830739202b1ff487

Summary by Sourcery

CI:

• Pin dtolnay/rust-toolchain action to commit 4305c38b25d97ef35a8ad1f985ccf2d2242004f2 instead of using the "stable" tag

Summary by CodeRabbit

• Chores
  • Updated the continuous integration workflow to improve Rust toolchain installation and ensure required components (rustfmt and clippy) are included. No changes to user-facing features.

[sourcery-ai]

Reviewer's Guide

The PR ensures reproducible CI runs by pinning the dtolnay/rust-toolchain GitHub Action to a specific commit rather than using a mutable branch reference.

File-Level Changes

Change	Details	Files
Pin rust-toolchain action to a specific commit	Replaced dtolnay/rust-toolchain@stable with dtolnay/rust-toolchain@4305c38	.github/workflows/ci.yml

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Walkthrough

The continuous integration workflow was updated to change the Rust toolchain setup method. The workflow now uses actions-rs/toolchain@v1 to install the stable Rust toolchain with rustfmt and clippy components, replacing the previous use of dtolnay/rust-toolchain@stable. No other workflow steps were altered.

Changes

File(s)	Change Summary
.github/workflows/ci.yml	Replaced Rust toolchain setup step with actions-rs/toolchain@v1, adding rustfmt and clippy components.

Possibly related PRs

• Add release workflow mdtablefix#3: Adds a release workflow that also involves Rust toolchain installation in GitHub Actions, relating to toolchain setup but in a different workflow context.

Poem

In the warren, CI hops anew,
With actions-rs, the toolchain grew.
Rustfmt and Clippy join the fun,
Ensuring code checks are never done.
🐇✨
The workflow’s neat, the carrots sweet—
Our builds are stable and complete!

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🧪 Generate Unit Tests

• Create PR with Unit Tests
• Commit Unit Tests in branch codex/pin-3rd-party-action-to-commit-hash
• Post Copyable Unit Tests in Comment

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[sourcery-ai]

Hey @leynos - I've reviewed your changes and they look great!

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[leynos]

@coderabbitai review

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