Update checkout ref

Author: jgchn

.github/workflows/run-examples-prep.yml

@@ -59,8 +59,6 @@ jobs:
     - uses: actions/checkout@v4
       if: ${{ steps.parse-run-examples-config.outputs.update_results && matrix.python-version == '3.13' }}
       with:
-        repository: ${{ github.repository }}
-        ref: ${{ github.head_ref }}
         fetch-depth: 0
     - name: Patch tests/test_examples_run.yaml with update_results to False, only for the last matrix version
       if: ${{ steps.parse-run-examples-config.outputs.update_results && matrix.python-version == '3.13' }}