Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -7,7 +7,7 @@ jobs:
   deploy:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: Set up Python
       uses: actions/setup-python@v6

.github/workflows/python-package.yml

@@ -17,7 +17,7 @@ jobs:
           - "3.13"
           - "3.14"
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: Set up Python ${{ matrix.python }}
       uses: actions/setup-python@v6