Run code quality checks on GitHub only once

Author: Cito

.github/workflows/test-package.yml

@@ -22,9 +22,11 @@ jobs:
         python -m pip install --upgrade pip
         pip install .[tests]
     - name: Lint with flake8
+      if: matrix.python-version == 3.8
       run: |
         flake8 webware setup.py --count --exit-zero --statistics
     - name: Lint with pylint
+      if: matrix.python-version == 3.8
       run: |
         pylint webware
     - name: Run all unit tests