Remove Python 3.6 from tests to fix tests

Python 3.6 is not available on ubuntu-latest (22.04).
It was available when ubuntu-latest was 20.04.

Author: RytoEX

.github/workflows/all-lints.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10']
     steps:
     - uses: actions/checkout@v1
     - uses: marian-code/python-lint-annotate@master