Bump actions/upload-artifact from 3 to 4

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]>

.github/workflows/test-docker-image.yml

@@ -41,15 +41,15 @@ jobs:
           ./compare-images.sh screenshot.png test-screenshot.png
 
       - name: Upload test-script artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: script-screenshots
           path: ./test-script/*-screenshot.png
           if-no-files-found: error
 
       - name: Upload test-docker-image artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: docker-screenshots