Bump zigpy to 1.3.0 to pull in serialx dependency

[puddly]

This migrates zigpy-znp to serialx, since it is one of the few dependencies using transport APIs for interfacing with modem pins. For this, we now use the async-safe transport.set_modem_pins interface instead of the transport.serial.dtr = ... one.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.49%. Comparing base (5d7931b) to head (f8c56b3).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #271      +/-   ##
==========================================
+ Coverage   98.46%   98.49%   +0.02%     
==========================================
  Files          43       43              
  Lines        3588     3579       -9     
==========================================
- Hits         3533     3525       -8     
+ Misses         55       54       -1     

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