chore(deps): update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/tests.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Check out the repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5