Update update-release.yml

Use the files from the head ref

Author: rvermeulen

.github/workflows/update-release.yml

@@ -31,6 +31,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0 # We need the full history to compute the changelog
+          ref: ${{ inputs.head-sha }}
 
       - name: Install Python
         uses: actions/setup-python@v4