Update codecov/codecov-action action to v4

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -41,4 +41,4 @@ jobs:
           arguments: --console=verbose clean checkstyleMain checkstyleTest test
 
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4