Bump actions/upload-artifact from 2 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...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/functionality-check.yml

@@ -38,7 +38,7 @@ jobs:
         run: mvn test -e -P fancy-report --color always
 
       - name: "Upload test report"
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: test-report-${{ env.COMMIT_SHA_ABREV }}-${{ env.RUN_DATE }}

.github/workflows/maven-test.yml

@@ -36,7 +36,7 @@ jobs:
         run: mvn test -e -P fancy-report --color always
 
       - name: "Upload test report"
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: test-report-${{ env.COMMIT_SHA_ABREV }}-${{ env.RUN_DATE }}