Fix actions/checkout for a fork in pre-commit workflow (#9043)

Author: alexreinking

.github/workflows/pre-commit.yml

@@ -19,6 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           ref: ${{ github.head_ref }}
 
       - uses: actions/setup-python@v5