GH-17: Remove 3.12 version of Python

Author: ArtyomVancyan

.github/workflows/tests.yml

@@ -25,8 +25,6 @@ jobs:
             env: python3.10
           - python-version: "3.11"
             env: python3.11
-          - python-version: "3.12"
-            env: python3.12
 
     steps:
       - uses: actions/checkout@v2

tox.ini

@@ -7,7 +7,6 @@ envlist =
     python3.9
     python3.10
     python3.11
-    python3.12
 isolated_build = true
 
 [testenv]