Bump actions/upload-artifact from 4 to 7 (#7)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
         run: ./gradlew test
 
       - name: Upload test results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: success() || failure()
         with:
           name: test-results-java-${{ matrix.java }}