github CI: use actions/setup-python@v4

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: 3.9
     - name: Lint with flake8
@@ -82,7 +82,7 @@ jobs:
         # just fetching 1 commit is not enough for setuptools-scm, so we fetch all
         fetch-depth: 0
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Cache pip

.github/workflows/codeql-analysis.yml

@@ -34,7 +34,7 @@ jobs:
         # just fetching 1 commit is not enough for setuptools-scm, so we fetch all
         fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: 3.9
     - name: Cache pip