Added 3.12 classifier

setup.py

diff --git a/setup.py b/setup.py
index 6595dfb..4313c16 100755
--- a/setup.py
+++ b/setup.py
@@ -55,6 +55,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
     ],
     project_urls={
         "Source": "https://github.com/certifi/python-certifi",