Fix broken workflow due to typo

.github/workflows/javascript-packages.yaml

@@ -13,7 +13,7 @@ jobs:
           uses: actions/checkout@v2
           with:
           # Make sure the actual branch is checked out when running on pull requests
-            ref: ${{ github.h
+            ref: ${{ github.head_ref }}
             
         - name: Install dependencies
           run: |