Update actions/checkout (#25)

Author: fabaff

.github/workflows/python.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: [ "3.10", "3.11", "3.12" ]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v4.2.2
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/[email protected]
       with: