Bump actions/upload-artifact from 4 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/tests.yaml

@@ -71,7 +71,7 @@ jobs:
           files: test_artifacts/cobertura.xml
 
       - name: Create artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: ${{ !cancelled() }}
         with:
           name: ${{ env.GITHUB_REPOSITORY_SLUG }}_test-artifacts_${{ github.event_name }}_${{ github.event.pull_request.number || github.sha }}_${{ matrix.os