drop py3.8, support 3.11

[alessandrofelder]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
We adhere to NEP 29 (and support for 3.8 was causing me problems cross-Python-version compatibility with importlib.resources in #91 )

What does this PR do?
Drop Python 3.8 support and optimistically support 3.11 (napari supports 3.11 for a few months now, I think).

References

Closes #102

How has this PR been tested?

Is this a breaking change?

Yes, for Python 3.8 users.

Does this PR require an update to the documentation?

Adherence to NEP 29 already official in our developer conventions, so no.

Checklist:

• The code has been tested locally
• [n/a] Tests have been added to cover all new functionality (unit & integration)
• [n/a] The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (d353a1e) 97.30% compared to head (a204460) 97.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #101   +/-   ##
=======================================
  Coverage   97.30%   97.30%           
=======================================
  Files           7        7           
  Lines         371      371           
=======================================
  Hits          361      361           
  Misses         10       10           

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