Add 3.13 to the supported python versions

Author: rhpvorderman

setup.py

@@ -151,6 +151,7 @@ def build_zlib_ng():
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Programming Language :: C",