We do not need to check typing for this project.

--- immutables-0.21/pyproject.toml.orig
+++ immutables-0.21/pyproject.toml
@@ -39,7 +39,6 @@
 test = [
     'flake8~=5.0',
     'pycodestyle~=2.9',
-    'mypy~=1.4',
     'pytest~=7.4',
 ]
 
--- immutables-0.21/tests/conftest.py.orig
+++ immutables-0.21/tests/conftest.py
@@ -1,17 +1,4 @@
 import sys
-# We need the mypy pytest plugin to do the test collection for our
-# typing tests.
-
-# mypy demands that its test-data be present for mypy.test.config to be
-# imported, so thwart that check. mypy PR #10919 fixes this.
-import unittest.mock
-with unittest.mock.patch('os.path.isdir') as isdir:
-    isdir.return_value = True
-    import mypy.test.config  # noqa
-
-pytest_plugins = [
-    'mypy.test.data',
-]
 
 if sys.version_info < (3, 10):
     collect_ignore = ["test_pattern_matching.py"]