bug#56757: Python f-string font-lock logic is incomplete

[Laurence Warne]

Hi, I've attached a patch which looks good to me locally using the above examples and others.

In addition to the above, mixed capitalizations are also covered: https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals.

Thanks!

0001-Apply-syntax-highlighting-for-all-python-f-strings.patch
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