Move stdlib imports above the 3rd party imports as suggested by @mgedmin

.

src/zope/app/wsgi/tests.py

@@ -12,16 +12,17 @@
 #
 ##############################################################################
 """WSGI tests"""
+import doctest
+import io
+import re
+import unittest
+
 from zope.app.wsgi.testing import SillyMiddleWare
 from zope.app.wsgi.testlayer import BrowserLayer
 from zope.authentication.interfaces import IUnauthenticatedPrincipal
 from zope.component.testlayer import ZCMLFileLayer
 from zope.publisher.interfaces.logginginfo import ILoggingInfo
 from zope.testing import renormalizing
-import doctest
-import io
-import re
-import unittest
 import zope.app.wsgi
 import zope.component
 import zope.component.testing