Stop running CI on Python 3.6

Author: vrslev

.github/workflows/python-versions.yml

@@ -5,12 +5,10 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - "3.6"
           - "3.7"
           - "3.8"
           - "3.9"
           - "3.10"
-          - "pypy-3.6"
           - "pypy-3.7"
           - "pypy-3.8"
     runs-on: ubuntu-latest