Add Python 3.12 classifier

Author: alexandermalyga

pyproject.toml

@@ -12,6 +12,7 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Typing :: Typed",
     "Intended Audience :: Developers",