GitHub Actions: Upgrade setup-python

Author: cclauss

.github/workflows/pythonapp.yml

@@ -17,7 +17,7 @@ jobs:
     name: Python sdist/wheel
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "3.10"
     - name: Install dependencies
@@ -50,7 +50,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -72,7 +72,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [dist]
     steps:
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "3.10"
     - uses: actions/download-artifact@v3