fix: homebrew cask job

.github/workflows/update-cask.yml

@@ -12,6 +12,9 @@ jobs:
       contents: write
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.repository.default_branch }}
+          fetch-depth: 0
 
       - name: Download and hash release
         id: release
@@ -30,8 +33,13 @@ jobs:
 
       - name: Commit
         run: |
+          BRANCH="${{ github.event.repository.default_branch }}"
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add Casks/plezy.rb
-          git diff --staged --quiet || git commit -m "chore: update cask to ${{ steps.release.outputs.version }}"
-          git push
+          if ! git diff --staged --quiet; then
+            git commit -m "chore: update cask to ${{ steps.release.outputs.version }}"
+            git push origin "HEAD:$BRANCH"
+          else
+            echo "No cask changes to commit."
+          fi