CLN: GH29547 format with f-strings

[DanBasson]

xref #29547,#34914
replace .format() for f-strings in the following:

pandas/tests/series/indexing/test_numeric.py

[WillAyd]

Thanks but I think the use of format here is better than a lambda. Basically any time we have to defer string evaluation like this format is better

[DanBasson]

Thanks @WillAyd .

i have a question though-when i made the recent pull request, the two CI were green but all others were red.
when i tried to follow the error i couldn't understand what the errors were.
perhaps you can tell me. what does it mean when there is a situation like that? how can i understand that better?

[WillAyd]

If you click on the Checks tab of the PR you should be able to see all of the failed builds. Click through them and you should see the test that failed