Update setup.py

Author: rinarakaki

setup.py

@@ -39,6 +39,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Topic :: Communications :: Telephony",