Update to use f-strings instead of `.format` now that Python 3.8 is supported

[Serene-Arc]

As stated in #5283 f-strings are now supported. These should be upgraded through the modules now that Python 3.8 is our minimum supported version. Probably needs to be done by hand to keep it understandable; not every instance should be changed.

[RollingStar]

More info: https://www.geeksforgeeks.org/formatted-string-literals-f-strings-python/

[bal-e]

I'll pick this up.