Update zope.testing to current version

The one used before can't be installed any more by current `setuptools` versions because it uses `2to3` which is no longer supported.

Update zope.testing to current version
The one used before can't be installed any more by current `setuptools` versions because it uses `2to3` which is no longer supported.
66f46227 · Michael Howitz · Godefroid Chapelle · a1015c21 · 66f46227
Commit 66f46227 authored Sep 28, 2021 by Michael Howitz Committed by Godefroid Chapelle Sep 29, 2021
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buildout.cfg buildout.cfg +1 -1

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--- a/buildout.cfg
+++ b/buildout.cfg
@@ -7,7 +7,7 @@ versions = versions
 zope.interface = 4.1.3
 zope.exceptions = 4.0.8
 zc.recipe.testrunner = 2.0.0
-zope.testing = 4.5.0
+zope.testing = 4.9
 coverage = 5.1
 [py]