Bump minimum python version

Python 3.9 benefits vcspull and libvcs could use:

• typing.TypedDict as of 3.8 (no need for backport package)
• typing.Protocol
• typing.Literal
• Typing syntax improvements: List[str] -> list[str] (Type Hinting Generics in Standard Collections)

Analysis of distros

• Debian python 3.9

  Bullseye is the codename for Debian 11, released on 2021-08-14. https://wiki.debian.org/DebianBullseye Python 3, 3.9.1

• RedHat RHEL uses 3.6 by default, has up to 3.9

  You can install Python 3.8 and Python 3.9, including packages built for either version, in parallel with Python 3.6 on the same system, with the exception of the mod_wsgi module. Due to a limitation of the Apache HTTP Server, only one of the python3-mod_wsgi, python38-mod_wsgi, or python39-mod_wsgi packages can be installed on a system. source

[Segaja]

@Segaja @rogerioefonseca Do you have a minimum python version you can handle? (if you’re still around) you’re the most communicable here of the now

I want to make 3.9 the minimum, would that impact your ability to use the package?

@tony since I’m on Arch Linux I don’t have a problem with setting 3.9 as minimum:

╰─ python --version
Python 3.10.2

[rogerioefonseca]

Hey there, I’m using python 3.9 for a while already, so no harm for me.