test.pythoninfo: Fix typo, Py_REF_DEBUG => Py_TRACE_REFS (GH-93467)

(cherry picked from commit d8f40ead)

Co-authored-by: Victor Stinner <vstinner@python.org>

Lib/test/pythoninfo.py

@@ -142,7 +142,7 @@ def collect_sys(info_add):
         text = 'Yes (sys.getobjects() present)'
     else:
         text = 'No (sys.getobjects() missing)'
-    info_add('build.Py_REF_DEBUG', text)
+    info_add('build.Py_TRACE_REFS', text)
 
 
 def collect_platform(info_add):