Remove 'suppress_known_deprecation' helper.

Author: jaraco

importlib_resources/tests/util.py

@@ -69,13 +69,6 @@ def create_package(file=None, path=None, is_package=True, contents=()):
     )
 
 
-@contextlib.contextmanager
-def suppress_known_deprecation():
-    with warnings.catch_warnings(record=True) as ctx:
-        warnings.simplefilter('default', category=DeprecationWarning)
-        yield ctx
-
-
 class CommonTests(metaclass=abc.ABCMeta):
     """
     Tests shared by test_open, test_path, and test_read.