Bump actions/upload-artifact from 3 to 4 (ParadoxGameConverters#245)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/linux_coverage.yml

@@ -50,7 +50,7 @@ jobs:
         github-token: ${{ secrets.GITHUB_TOKEN }}
         path-to-lcov: build/lcoverage/coverage.info
 
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: coverage-report
         path: build/lcoverage/