fix(ci): Update GitHub Actions versions and add permissions

[Snider]

This commit updates the .github/workflows/mkdocs.yml file to use the latest versions of the actions/checkout and actions/setup-python actions.

Key changes:

• Upgraded actions/checkout from v2 to v4.
• Upgraded actions/setup-python from v2 to v5.
• Pinned the Python version to '3.11'.
• Added permissions: contents: write to the deploy job to ensure the workflow has the necessary permissions to publish to GitHub Pages.

[coderabbitai]

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📝 Walkthrough

Summary by CodeRabbit

Chores

• Upgraded GitHub Actions workflow to latest action versions for improved build reliability.
• Pinned Python version for consistent build environments.
• Enhanced deployment permissions in workflow configuration.

Walkthrough

GitHub Actions workflow for MkDocs deployment is updated to use newer action versions (checkout v4, setup-python v5) and pin Python to version 3.11 explicitly. The deploy job gains a permissions configuration for writing contents.

Changes

Cohort / File(s)	Summary
MkDocs Workflow Upgrade .github/workflows/mkdocs.yml	Upgraded checkout action from v2 to v4, setup-python action from v2 to v5, pinned Python version to 3.11, and added permissions scope for contents write access to the deploy job

Possibly related PRs

• feat: Add MkDocs site and deployment workflow #7: Introduces the initial MkDocs deployment workflow that this PR subsequently updates with newer action versions and Python pinning.

Poem

🐰 A rabbit hops through workflow files,
Updating actions with glee and smiles,
From v2 to v4, v5 so new,
Python 3.11, permissions too!
Automated deployments, ever refined—
A modern workflow, one step at a time. 🌿

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat-mkdocs-site

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📥 Commits

Reviewing files that changed from the base of the PR and between f074f6f and 038ede4.

📒 Files selected for processing (1)

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

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