style: explicitly set persist-credentials: true with comment

Author: suztomo

.github/workflows/java-cloud-bom-update-readme-table.yaml

@@ -25,6 +25,9 @@ jobs:
     steps:
     - name: Check out repository
       uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0
+      with:
+        # Explicitly persist credentials so subsequent git push steps can authenticate with origin
+        persist-credentials: true
 
     - name: Set up Python
       uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6