Upgrade GitHub Actions

.github/workflows/python-package.yml

@@ -14,18 +14,14 b' jobs:'
 
     runs-on: ubuntu-latest
     timeout-minutes: 5
-    strategy:
-      matrix:
-        python-version: [3.8]
-
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 0
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+    - name: Set up Python
+      uses: actions/setup-python@v4
       with:
-        python-version: ${{ matrix.python-version }}
+        python-version: 3.x
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip