Enable TestJsonEncoding tests

Author: hugovk

Lib/test/test_free_threading/test_json.py

@@ -29,7 +29,6 @@ def items(self):
         return self.mapping
 
 
-@threading_helper.reap_threads
 @threading_helper.requires_working_threading()
 class TestJsonEncoding(CTest):
     # Test encoding json with concurrent threads modifying the data cannot