ci: bump actions/checkout to v4

[dizer-ti]

Hey ! GitHub‑hosted runners now use Node 20, so checkout v4 is required
This PR updates all workflows to actions/checkout@v4 , no functional changes expected

Summary by CodeRabbit

• Chores
  • Updated deployment and automation workflows to use the latest version of repository checkout actions, improving reliability and compatibility. No changes to workflow behavior or user-facing features.

[coderabbitai]

Walkthrough

The updates modify three GitHub Actions workflow files to use version 4 of the actions/checkout action instead of version 3. No other steps, logic, or configurations within these workflows were altered. The affected workflows are responsible for deploying a VitePress site, handling PR previews, and managing the latest tags and commit SHAs.

Changes

File(s)	Change Summary
.github/workflows/deploy.yml	Updated actions/checkout to version 4 in the deployment workflow for VitePress site.
.github/workflows/latest_tags.yml	Updated actions/checkout to version 4 in the job that manages latest tags and commit SHAs.
.github/workflows/preview.yml	Updated actions/checkout to version 4 in the PR preview deployment workflow.

Suggested reviewers

• jcstein

Poem

A hop and a skip, a version we flip,
From three to four, our workflows equip.
With checkout anew, our Actions run true,
Deployments and tags, all fresh as the dew.
🐇✨
So onward we bound, with updates profound!

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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 aac8a89 and 10db66e.

📒 Files selected for processing (3)

• .github/workflows/deploy.yml (1 hunks)
• .github/workflows/latest_tags.yml (1 hunks)
• .github/workflows/preview.yml (1 hunks)

✅ Files skipped from review due to trivial changes (3)

• .github/workflows/deploy.yml
• .github/workflows/preview.yml
• .github/workflows/latest_tags.yml

---

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[Copilot]

Pull Request Overview

This PR bumps the GitHub Actions checkout action from v3 to the new v4 version to ensure compatibility with Node 20 on GitHub‑hosted runners.

• Updated checkout actions in preview, latest_tags, and deploy workflows.
• Ensures improved reliability and compatibility with the current runner environments.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/preview.yml	Updated checkout action from v3 to v4.
.github/workflows/latest_tags.yml	Updated checkout action from v3 to v4.
.github/workflows/deploy.yml	Updated checkout action from v3 to v4.

[jcstein]

OK