fix: grant pull-requests write permission for label syncing

Signed-off-by: darshit2308 <darshit2308@gmail.com>

Author: darshit2308

.github/workflows/review-sync.yml

@@ -23,7 +23,7 @@ on:
         type: string
 
 permissions:
-  pull-requests: read
+  pull-requests: write
   issues: write
   contents: read