move test to 3.8, 3.12 and PyPy-3.10

Author: stonebig

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.6, 'pypy-3.7']
+        python-version: [3.8, 3.12, 'pypy-3.10']
 
     steps:
     - uses: actions/checkout@v2