We do not need to check typing for this project.

--- traitlets-5.15.0/pyproject.toml.orig
+++ traitlets-5.15.0/pyproject.toml
@@ -33,9 +33,6 @@
 [project.optional-dependencies]
 test = [
     "argcomplete>=3.0.3",
-    "mypy>=1.7.0",
-    # see https://github.com/python/mypy/issues/20454
-    "mypy>=1.7.0,<1.19 ; platform_python_implementation == 'PyPy'",
     "pytest-mock",
     "pytest>=7.0,<8.2",
 ]