chore(deps): pin boneskull/gh-stack action to 65dc9a5

Author: renovate[bot]

.github/workflows/claude-code-review.yml

@@ -10,5 +10,5 @@ jobs:
     if: |
       github.event.pull_request.head.repo.full_name == github.repository
     # Job body always comes from main so edits to these workflows on a PR cannot break the check.
-    uses: boneskull/gh-stack/.github/workflows/claude-code-review-reusable.yml@main
+    uses: boneskull/gh-stack/.github/workflows/claude-code-review-reusable.yml@65dc9a5677adb3e60f5d9f8641105c179b12757e # main
     secrets: inherit