Remove workaround.

Author: jaraco

Lib/test/test_importlib/metadata/test_main.py

@@ -22,7 +22,6 @@
 )
 
 from . import fixtures
-from . import _issue138313
 from ._path import Symlink
 
 
@@ -358,7 +357,6 @@ def test_packages_distributions_example(self):
         self._fixture_on_path('example-21.12-py3-none-any.whl')
         assert packages_distributions()['example'] == ['example']
 
-    @_issue138313.skip_on_buildbot
     def test_packages_distributions_example2(self):
         """
         Test packages_distributions on a wheel built