chore: upgrade checkout step to v4

[ChristianTackeGSI]

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Checklist:

• Rebased against dev branch
• My name is in the resp. CONTRIBUTORS/AUTHORS file
• Followed the seven rules of great commit messages

[coderabbitai]

Walkthrough

Walkthrough

The recent update in the repository involves a single change where the GitHub Actions workflow file has been modified. Specifically, the checkout action used within the .github/workflows/codemeta_validate.yaml workflow has been upgraded from version 3 to version 4. This change may introduce new functionalities or adjustments to the workflow's behavior due to the new version of the checkout action.

Changes

File Path	Change Summary
.github/workflows/codemeta_validate.yaml	Updated GitHub Actions checkout action from v3 to v4.

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The base branch was changed.