Update codecov/codecov-action action to v4

Author: renovate[bot]

.github/workflows/maven.yml

@@ -35,6 +35,6 @@ jobs:
       run: mvn -Pjacoco clean verify -B -V --no-transfer-progress ${{ matrix.flags }}
 
     - name: Codecov coverage
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         file: '*jacoco.xml'