Add pull requests permission to create newsletter CI

Author: AngelOnFira

Diff for: .github/workflows/create-newsletter.yaml

@@ -7,7 +7,8 @@ on:
     inputs: {}
 permissions:
   contents: write
-  issues: write 
+  issues: write
+  pull-requests: write
 jobs:
   create-newsletter:
     runs-on: ubuntu-latest