refactor: fix quoting for clarity

[tgilon]

Closes #789.

Changes proposed in this Pull Request

This PR suggests changing the quoting patterns for clarity. However, it's legal in Python 3.12+ to reuse the same quote character inside an f-string. Since python 3.12 is implicitly required, this change is not strictly necessary.

This PR relates to PyPSA#2235.

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[daniel-rdt]

Thanks for this. I checked and couldn't find any other instances. Note, there is also no instances where it is the other way around (f'xyz{'abc'}').

I was also only able to find three instances (#1, #2, #3) where the quoting is reversed (i.e. f'abc') and they all come from upstream. All three are queries though, so could also be intentional