chore: yamlfix file

Author: mpenning

.github/workflows/tests.yml

@@ -42,7 +42,7 @@ jobs:
           - {name: 'PyPy', python: 'pypy-3.10', os: 'ubuntu-latest', tox: 'pypy310'}
           - {name: 'Minimum Versions', python: '3.11', os: 'ubuntu-latest', tox: 'py311'}
     steps:
-      - uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8' # v5.0.0
+      - uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8'  # v5.0.0
       - uses: 'actions/setup-python@v5'
         with:
           python-version: '${{ matrix.python }}'