CLN: F-string formatting in pandas/_libs/*.pyx
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Super lost,
the tests that failed before are now passing, and the test that passed before are now failing, all I changed was 5 spaces before a string to make pep8 happy.

I have no clue what am I doing wrong.

can anyone help? @jbrockmendel You legend!!! thanks @MomIsBestFriend 

if you can make a master issue for this; would like to do the entire codebase but in multiple PRs, then add a check that we don't regress these changes.