Fix CI toolchain detection

[leynos]

Summary

• rename rust-toolchain.toml to rust-toolchain so CI finds the toolchain

Testing

• cargo fmt --all
• cargo clippy -- -D warnings
• RUSTFLAGS="-D warnings" cargo test
• markdownlint '**/*.md'
• nixie docs

---

https://chatgpt.com/codex/tasks/task_e_6850483529648322a4daa23d666130de

Summary by CodeRabbit

• Chores
  • Updated the continuous integration workflow to use a new Rust toolchain setup action.

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Walkthrough

The continuous integration workflow for GitHub Actions was updated to use a new Rust toolchain setup action. The previous action was replaced with a newer one, and the indentation of related configuration keys was adjusted. No other workflow steps or environment variables were changed.

Changes

File(s)	Change Summary
.github/workflows/ci.yml	Replaced Rust toolchain setup action with a new version and corrected indentation of settings.

Possibly related PRs

• Fix unpinned action #57: Updates the GitHub Actions workflow to modify the Rust toolchain setup action, similar to this PR.
• Configure nightly rustfmt mdtablefix#48: Alters the CI workflow to configure a specific nightly Rust toolchain and rustfmt, involving Rust toolchain setup changes.
• Replace workflow with CI job ortho-config#38: Modifies the same workflow file by introducing a new CI job and removing an old coverage workflow, related in the context of CI updates.

Poem

A hop and a skip through YAML today,
The Rust toolchain finds a brand new way.
Indents aligned, the steps are neat,
CI’s rhythm skips no beat.
With every build, the code will shine—
A rabbit’s touch in every line!
🐇✨

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Actionable comments posted: 2

📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1016e28 and bb0c3a4.

📒 Files selected for processing (1)

• .github/workflows/ci.yml (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: build-test