packaging: Add Python 3.12 to trove classifiers

Author: tony

pyproject.toml

@@ -16,6 +16,7 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: Utilities",
   "Topic :: System :: Shells",