fix quote

Author: soutaro

.github/workflows/bundle-update.yml

@@ -53,7 +53,7 @@ jobs:
           GH_TOKEN: ${{ github.token }}
         run: |
           gh pr create \
-            --title "bundle update `/Gemfile`" \
+            --title 'bundle update (`/Gemfile`)' \
             --body "Automated bundle update" \
             --head "$(git rev-parse --abbrev-ref HEAD)" \
             --base "${{ github.event.repository.default_branch }}"