add 3.12 nightly (#226)

Author: kumaraditya303

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         # Test all supported versions on Ubuntu:
         os: [ubuntu-latest]
-        python: ["3.7", "3.8", "3.9", "3.10", 3.11-dev]
+        python: ["3.7", "3.8", "3.9", "3.10", 3.11-dev, 3.12-dev]
         include:
           # Also test PyPy, macOS, and Windows:
           - os: ubuntu-latest