Dropped support for Python 3.6 and 3.7.

Author: jfjlaros

.github/workflows/python-package.yml

@@ -12,10 +12,11 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - 3.6
-          - 3.7
           - 3.8
           - 3.9
+          - 3.10
+          - 3.11
+          - 3.12
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}