Remove Python 3.6 from CI builds

Author: seratch

.github/workflows/py_compile.yml

@@ -10,7 +10,7 @@ jobs:
     timeout-minutes: 5
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}