Rely on dict on Python 3.7 and later where ordering is guaranteed. Pe…

…rformance is better. Ref python/cpython#18540 (comment).

zipp.py

@@ -3,7 +3,12 @@
 import zipfile
 import itertools
 import contextlib
-from collections import OrderedDict
+import sys
+
+if sys.version_info < (3, 7):
+    from collections import OrderedDict
+else:
+    OrderedDict = dict
 
 
 def _parents(path):