build(deps): bump actions/checkout from 3 to 4 (#76)

.github/workflows/python.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         python-version: ['3.9']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
@@ -45,7 +45,7 @@ jobs:
         - '3.10'
       fail-fast: false
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}