Add permissions to conflicts workflow

Author: samwelkanda

.github/workflows/conflicting-pr-label.yml

@@ -11,6 +11,10 @@ on:
     types: [synchronize]
     branches: [main]
 
+permissions:
+  pull-requests: write
+  contents: read
+
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"