Update actions

.github/workflows/tests.yml

@@ -9,9 +9,9 @@ jobs:
       matrix:
         python-version: ['3.8', '3.11']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies