Bump python version.

[s3rius]

Python 3.8 has reached it's EOL according to official version status. and can be safely dropped.

izulu/pyproject.toml

Line 9 in c0806de

requires-python = ">=3.8"

[pyctrl]

I have users with this version of Python. I'd like to support them this year.
I would be glad to drop it as soon as they upgrade their runtime.

[s3rius]

Okay. I'll leave this issue open. Consider closing it anytime.