pre-commit is not needed to run tests.

--- traitlets-5.15.1/pyproject.toml.orig
+++ traitlets-5.15.1/pyproject.toml
@@ -38,7 +38,6 @@
     # `reveal_type()` representations were simplified in
     # https://github.com/python/mypy/pull/20929
     "mypy>=1.17.0,<1.19",
-    "pre-commit",
     "pytest-mock",
     "pytest>=7.0,<8.2",
 ]