Add Python 3.12 to setup.py classifiers (#1298)

Author: schroedtert

setup.py

@@ -291,6 +291,7 @@ def build_extension(self, ext: CMakeExtension) -> None:
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Intended Audience :: Developers",
         "Intended Audience :: Science/Research",
     ],