GitHub Actions maintenance

.github/workflows/build.yml

@@ -4,20 +4,25 @@ on: push
 
 jobs:
   build:
-    runs-on: ubuntu-latest
     name: Build
+    runs-on: ubuntu-latest
+
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+
       - name: Set up Python 3.8
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.8
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           pip install pylint
           pip install -r requirements.txt --no-deps
+
       - name: Run linter
         run: pylint -E oec
+
       - name: Run unit tests
         run: ./run_unit_tests.sh