Add freethreading flag.

Author: ionelmc

src/hunter/_event.pyx

@@ -1,4 +1,4 @@
-# cython: linetrace=True, language_level=3str, c_string_encoding=ascii
+# cython: linetrace=True, language_level=3str, c_string_encoding=ascii, freethreading_compatible=True
 from functools import partial
 from linecache import getline
 from linecache import getlines

src/hunter/_predicates.pyx

@@ -1,4 +1,4 @@
-# cython: linetrace=True, language_level=3str, c_api_binop_methods=True
+# cython: linetrace=True, language_level=3str, c_api_binop_methods=True, freethreading_compatible=True
 from __future__ import absolute_import
 
 from collections import deque

src/hunter/_tracer.pyx

@@ -1,4 +1,4 @@
-# cython: linetrace=True, language_level=3str
+# cython: linetrace=True, language_level=3str, freethreading_compatible=True
 import threading
 import traceback