Updated .format() to f-strings
- [ ] references #29547
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Thanks @dlalap congrats on first PR. If you'd like to address some suggestions from @jbrockmendel in a follow up would certainly welcome, along with any other contributions