Doesn't catch Python 3.12 f-strings changes

[me21]

Describe the bug
Vermin doesn't catch changes introduced in Python 3.12 to f-strings. Specifically, f-string nesting. See https://docs.python.org/3/whatsnew/3.12.html#pep-701-syntactic-formalization-of-f-strings

To Reproduce
I had the following line in my source:
Paragraph(f'{split_fio_birthdate(visitor['fio'])[0]}', normal_style), (please note single quotes inside f-string as well as enclosing ones).

When I invoked vermin with vermin -v --exclude-regex venv ., it incorrectly marked the file containing that line as !2, 3.9. The actual run attempt on Python 3.11.2 threw the following error: SyntaxError: f-string: unmatched '['.

Expected behavior
The file should be marked as !2, 3.12.

Environment (please complete the following information):

• vermin 1.6.0
• Python 3.12 on the machine I run vermin on (I think with Python 3.11 that line might trigger syntax error)