Fix release-bot workflow permissions causing startup_failure

The reusable workflow at TykTechnologies/github-actions requires
contents: write, pull-requests: write, and issues: write to create
cherry-pick PRs. The caller was only granting read permissions,
causing GitHub to reject the job at startup.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: buger

.github/workflows/release-bot.yaml

@@ -5,8 +5,9 @@ on:
     types: [created]
 
 permissions:
-  contents: read
-  issues: read
+  contents: write
+  pull-requests: write
+  issues: write
 
 jobs:
   release_bot: