[ci] Add write permissions for pull-requests in commitflow workflow (#4030)

- Added for pytest coverage comment actions workflow

Author: Harshg999

.github/workflows/commitflow-py3.yml

@@ -15,6 +15,9 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.8', '3.9', '3.10', '3.11']
+    
+    permissions:
+      pull-requests: write
 
     steps:
     - name: Checkout