Fix incorrect usage of support.requires_gil_enabled (#118170)

Author: Eclips4

Lib/test/test_capi/test_mem.py

@@ -153,7 +153,7 @@ class C(): pass
 
 
 # free-threading requires mimalloc (not malloc)
-@support.requires_gil_enabled
+@support.requires_gil_enabled()
 class PyMemMallocDebugTests(PyMemDebugTests):
     PYTHONMALLOC = 'malloc_debug'
 

Lib/test/test_gdb/test_backtrace.py

@@ -49,7 +49,7 @@ def test_bt_full(self):
 
     @unittest.skipIf(python_is_optimized(),
                      "Python was compiled with optimizations")
-    @support.requires_gil_enabled
+    @support.requires_gil_enabled()
     @support.requires_resource('cpu')
     def test_threads(self):
         'Verify that "py-bt" indicates threads that are waiting for the GIL'