Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/server-tests.yml

@@ -62,7 +62,7 @@ jobs:
       with:
         python-version: '3.12.6'
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       if: steps.check-changes.outputs.result == 'true'
 
     - name: Cache pip