Bump actions/upload-artifact from 4 to 5 (#59)

Author: dependabot[bot]

.github/workflows/gradle.yml

@@ -38,7 +38,7 @@ jobs:
         run: ./gradlew build
 
       - name: Save Test Reports
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         if: always()
         with:
           name: test-reports-${{ matrix.os }}-${{ matrix.java-version }}-${{ matrix.distribution }}