Adjust github test action

Author: laurynas

.github/workflows/main.yml

@@ -6,16 +6,13 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - '3.6'
-          - '3.7'
           - '3.8'
           - '3.9'
           - '3.10'
           - '3.11'
           - '3.12'
           - '3.13'
           - '3.14'
-          - '3.15'
     name: Python ${{ matrix.python-version }} sample
     steps:
       - uses: actions/checkout@v4