Use CODECOV_TOKEN (opensearch-project#14536)

Signed-off-by: Prudhvi Godithi <pgodithi@amazon.com>

Author: prudhvigodithi

.github/workflows/gradle-check.yml

@@ -113,6 +113,7 @@ jobs:
         if: success()
         uses: codecov/codecov-action@v4
         with:
+          token: ${{ secrets.CODECOV_TOKEN }}
           files: ./codeCoverage.xml
 
       - name: Create Comment Success