Sync the importlib magic number in test_importlib for 3.7.0
diff --git a/Lib/test/test_importlib/test_util.py b/Lib/test/test_importlib/test_util.py
index c285d7b..bcbc99f 100644
--- a/Lib/test/test_importlib/test_util.py
+++ b/Lib/test/test_importlib/test_util.py
@@ -789,7 +789,7 @@
         in advance. Such exceptional releases will then require an
         adjustment to this test case.
         """
-        EXPECTED_MAGIC_NUMBER = 3379
+        EXPECTED_MAGIC_NUMBER = 3394
         actual = int.from_bytes(importlib.util.MAGIC_NUMBER[:2], 'little')
 
         msg = (