feat!: drop support for Python <3.9

[Simoh23999]

trying to fix #805

• the library no longer supports python versions below 3.10

• I set 3.10 as the min supported version because 3.9 will no longer be supported in 6 months.

• I haven’t made any significant changes to the codebase, waiting your point of view
  for example, we could update "Union" and "Optional" types to use the pipe operator | if you like.

Let me know if I should make any additional changes 👍

[jkowalleck]

I set 3.10 as the min supported version because 3.9 will no longer be supported in 6 months.

we dont plan on dropping py3.9 support right now.

[jkowalleck]

I haven’t made any significant changes to the codebase, waiting your point of view
for example, we could update "Union" and "Optional" types to use the pipe operator | if you like.

after properly raising the runtime requirement to py3.9, please migrate the code, any dependencies and configs where possible. 👍

[Simoh23999]

Ok, thanks for the clarification. I'll try to make those changes

[Simoh23999]

Please check these changes.

• I've updated the code and dependencies
• As part of the migration to Python 3.9+, I applied changes based on PEP 585, replacing legacy typing generics like Dict and Tuple with built-in generics

[jkowalleck]

thank you for donating this feature, @Simoh23999 .

Please keep your fork of the PR available until it is merged eventually