Clean up CI and switch to ruff

[puddly]

zigpy-znp's CI is a little old and https://github.com/fsouza/autoflake8 has now disappeared, causing CI to fail. This PR migrates zigpy-znp to match the CI style of the other more recent zigpy repos.

[codecov]

Codecov Report

❌ Patch coverage is 97.43590% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.54%. Comparing base (8a4d3fd) to head (2ff4427).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
zigpy_znp/api.py	95.23%	1 Missing ⚠️
zigpy_znp/tools/flash_read.py	66.66%	1 Missing ⚠️
zigpy_znp/tools/flash_write.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #281      +/-   ##
==========================================
+ Coverage   98.49%   98.54%   +0.05%     
==========================================
  Files          43       43              
  Lines        3583     3581       -2     
==========================================
  Hits         3529     3529              
+ Misses         54       52       -2     

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