Update checkout action on GHA CI and fix Lua 5.4 compat

[Flamefire]

The v2 might no longer work or soon stop working after GH updated to Node 20

Requires:

• fix: build error on lua 5.4.x #101

Summary by Sourcery

CI:

• Update checkout action to v4.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the GitHub Actions workflow to use actions/checkout@v4 instead of actions/checkout@v2 because v2 might stop working after GitHub updated to Node 20.

File-Level Changes

Change	Details	Files
Update checkout action	Update actions/checkout from v2 to v4	.github/workflows/test.yml

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time. You can also use
  this command to specify where the summary should be inserted.

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[sourcery-ai]

Hey @Flamefire - I've reviewed your changes - here's some feedback:

Overall Comments:

• The PR title mentions updating a cache action, but the changes show an update to the checkout action instead. Please update the PR title to accurately reflect the changes being made.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}