Add Trove classifier for Python 3.12 (#107)

Author: hugovk

src/trove_classifiers/__init__.py

@@ -468,6 +468,7 @@
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: Implementation",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: IronPython",