Use checkout action and direct python setup

.gitea/workflows/ci.yml

@@ -9,9 +9,10 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - name: Setup Python
-      run: |
-        python3 --version
-        pip3 install -e . pytest pytest-asyncio
-    - name: Run tests
-      run: pytest tests/ -v
+      - uses: actions/checkout@v4
+      - name: Setup Python
+        run: |
+          python3 --version
+          pip3 install -e . pytest pytest-asyncio
+      - name: Run tests
+        run: pytest tests/ -v