Fix test

Author: StanFromIreland

Lib/test/test_traceback.py

@@ -5064,7 +5064,7 @@ def test_missing_stdlib_module(self):
         code = """
             import sys
             import traceback
-            traceback.MISSING_STDLIB_MODULE_MESSAGES = {'spam': 'Install 'spam4life' for 'spam''}
+            traceback.MISSING_STDLIB_MODULE_MESSAGES = {'spam': "Install 'spam4life' for 'spam'"}
             sys.stdlib_module_names |= {'spam'}
             import spam
         """