Update GitHub Actions versions (#282)

Author: Klaus Rettinghaus

.github/workflows/checks.yml

@@ -31,10 +31,10 @@ jobs:
             TOXENV: twinecheck
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
 

.github/workflows/publish.yml

@@ -7,7 +7,7 @@ jobs:
     if: startsWith(github.event.ref, 'refs/tags/')
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python 3.10
       uses: actions/setup-python@v4

.github/workflows/tests.yml

@@ -25,7 +25,7 @@ jobs:
             TOXENV: pypy3
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install system libraries
       if: contains(matrix.python-version, 'pypy3.9')