added classifier

Author: flexatone

setup.py

@@ -83,6 +83,7 @@ def get_ext_dir(*components: tp.Iterable[str]) -> tp.Sequence[str]:
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
         'Programming Language :: Python :: 3.13',
+        'Programming Language :: Python :: Free Threading',
         'Typing :: Typed',
     ],
     keywords='numpy array',