Update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/codecov.yml

@@ -24,7 +24,7 @@ jobs:
           restore-keys: |
             maven-
       - run: mvn install -Pjacoco
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./target/site/jacoco/jacoco.xml