Allow generate-telecon-agenda to generate PRs (#1292)

Author: keithamus

.github/workflows/generate-telecon-agenda.yml

@@ -12,6 +12,7 @@ jobs:
     permissions:
       # Allows this GitHub Action to push to the main repo
       contents: write
+      pull-requests: write
     steps:
       - name: Checkout
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0