Require Python 3.9+

[jodal]

• Require Python 3.9+
• Import from collections.abc
• Use dict/list/tuple in types

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.32%. Comparing base (c670920) to head (b78739e).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pykka/_types.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
+ Coverage   93.30%   93.32%   +0.01%     
==========================================
  Files          14       14              
  Lines         553      554       +1     
  Branches       76       47      -29     
==========================================
+ Hits          516      517       +1     
  Misses         32       32              
  Partials        5        5              

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