github actions: Update recommended Rust to 1.91.0

[mulkieran]

Related stratis-storage/project#826

Summary by CodeRabbit

• Chores
  • Updated development toolchain versions for continuous integration processes.

[coderabbitai]

Walkthrough

Updated the Rust toolchain version used in the spelling-checks CI workflow step from 1.90.0 to 1.91.0. This is a version bump with no logic or functionality changes.

Changes

Cohort / File(s)	Summary
Rust toolchain version bump ​.github/workflows/main.yml	Updated Rust toolchain version in spelling-checks workflow step from 1.90.0 to 1.91.0

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

• This is a straightforward configuration version bump with no logic or behavioral changes.

Possibly related PRs

• github actions: Update recommended Rust to 1.90.0 #374: Also modifies the same .github/workflows/main.yml file and bumps the Rust toolchain version in the spelling-checks job (from 1.90.0 as a prior step to this 1.91.0 update).

Poem

🐰✨ A rabbit hops through CI dreams,
Where Rust flows like moonlit streams,
From 1.90 we leap to 1.91,
Toolchains updated, another job well done! 🛠️

Pre-merge checks and finishing touches

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The pull request title "github actions: Update recommended Rust to 1.91.0" directly and accurately describes the main change in the changeset. The modification updates the Rust toolchain version in .github/workflows/main.yml from 1.90.0 to 1.91.0, which matches exactly what the title conveys. The title is concise, specific, and clear enough that a developer scanning the commit history would immediately understand the purpose of this change without ambiguity or vague language.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 51dfeb5 and 104bd16.

📒 Files selected for processing (1)

• .github/workflows/main.yml (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: spelling-checks
• GitHub Check: docs-checks

🔇 Additional comments (1)

.github/workflows/main.yml (1)

57-57: Rust 1.91.0 version bump verified.

Rust 1.91.0 (stable) was released on October 30, 2025. The change is isolated to line 57 in .github/workflows/main.yml, and no conflicting Rust version references exist elsewhere in the codebase. This is a low-risk, straightforward update to the toolchain used by the spelling-checks CI job.

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