adding 3.12 as a test runner

Author: maxkahan

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ["3.8", "3.9", "3.10", "3.11"]
+        python: ["3.8", "3.9", "3.10", "3.11", "3.12"]
         os: ["ubuntu-latest", "macos-latest"]
     steps:
       - uses: actions/setup-python@v4