Add workflows permission to GitHub Actions

The workflows need 'workflows: write' permission to push changes that modify
workflow files. This is required when cherry-picking patches that include
workflow updates.

Fixes error: 'refusing to allow a GitHub App to create or update workflow
without workflows permission'

Author: adityamaru

.github/workflows/rebase-upstream.yml

@@ -9,6 +9,7 @@ on:
 permissions:
   contents: write
   issues: write
+  workflows: write
 
 jobs:
   rebase:

.github/workflows/release-patched-version.yml

@@ -15,6 +15,7 @@ on:
 
 permissions:
   contents: write
+  workflows: write
 
 jobs:
   create-patched-release: