[Infra] Update generate_issues.yml to give GITHUB_TOKEN write permissions for issues. (#14529)

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: ncooke3

.github/workflows/generate_issues.yml

@@ -8,6 +8,10 @@ on:
   schedule:
     # Run every day at 4am (PST) - cron uses UTC times
     - cron:  '0 12 * * *'
+
+permissions:
+  issues: write
+
 jobs:
   generate_an_issue:
     # Don't run on private repo.