FIX: Typing annotations Running `mypy -p IPython.sphinxext` raised a few errors. Fix them and strip some trailing whitespace from a few places.

back to dev

release 8.29.0

Whats new 8.29 (#14560)

Whats new 8.29

Fix line stripping edge case for %load magic command (#14495) Closes: #14494

Refactor with Pathlib for setupbase.py (#14543) Continued efforts for #12515 though it has been closed. Validated to be okay by running the following. - `pip install -e ".[all]"` - `pytest` Please note that there are also some syntactical modifications, and part of them are from the darker linter.

Fix re pattern pretty print (#14559) Alternative to #14558

Fix formatting

Fix line stripping logic