fix: checkout via ref to skip detach

Author: rrrodzilla

.github/workflows/changelog.yml

@@ -14,7 +14,7 @@ jobs:
           fetch-tags: true
           fetch-depth: 0
           repository: "Govcraft/rust-docs-mcp-server"
-      - run: git checkout HEAD^
+          ref: ${{ github.head_ref }}
 
       - name: Install gitchglog
         run: |