fix workflow

Author: Christopher Doris

.github/workflows/register-pypi.yml

@@ -12,7 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-      ref: ${{ inputs.git_ref }}
+      with:
+        ref: ${{ inputs.git_ref }}
     - name: Set up Python
       uses: actions/setup-python@v3
       with: