Add python 3.8 linter to detect legacy errors

Author: deajan

.github/workflows/pylint-linux.yaml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         # python-version: [3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, "3.10", 'pypy-3.6', 'pypy-3.7']
-        python-version: ["3.12"]
+        python-version: ["3.8", "3.12"]
 
     steps:
     - uses: actions/checkout@v2