allowing gha to write to contents for bump version (#1406)

.github/workflows/merge_to_main_staging.yml

@@ -18,7 +18,7 @@ defaults:
 
 permissions:
   id-token: write   # This is required for requesting the OIDC JWT
-  contents: read    # This is required for actions/checkout      
+  contents: write    # This is required for actions/checkout      
 
 env:
   AWS_REGION: ca-central-1