.github/workflows/main.yml: Update actions

Author: Matthias Koeppe

.github/workflows/main.yml

@@ -26,12 +26,12 @@ jobs:
                       architecture: x86
         steps:
         - name: Set up the repository
-          uses: actions/checkout@v2
+          uses: actions/checkout@v4
           with:
               submodules: recursive
               fetch-depth: 0
         - name: Set up Python ${{ matrix.python-version }}
-          uses: actions/setup-python@v2
+          uses: actions/setup-python@v5
           with:
             python-version: ${{ matrix.python-version }}
             architecture: ${{ matrix.architecture }}