Add exclusions for pytest 7 deprecations in plugins. Fixes jaraco/skeleton#57.

Author: jaraco

pytest.ini

@@ -5,3 +5,14 @@ doctest_optionflags=ALLOW_UNICODE ELLIPSIS
 filterwarnings=
 	# Suppress deprecation warning in flake8
 	ignore:SelectableGroups dict interface is deprecated::flake8
+
+	# shopkeep/pytest-black#55
+	ignore:<class 'pytest_black.BlackItem'> is not using a cooperative constructor:pytest.PytestDeprecationWarning
+	ignore:The \(fspath. py.path.local\) argument to BlackItem is deprecated.:pytest.PytestRemovedIn8Warning
+
+	# tholo/pytest-flake8#83
+	ignore:<class 'pytest_flake8.Flake8Item'> is not using a cooperative constructor:pytest.PytestDeprecationWarning
+	ignore:The \(fspath. py.path.local\) argument to Flake8Item is deprecated.:pytest.PytestRemovedIn8Warning
+
+	# dbader/pytest-mypy#131
+	ignore:The \(fspath. py.path.local\) argument to MypyFile is deprecated.:pytest.PytestRemovedIn8Warning