Remove pyserial dependencies

[TheJulianJES]

Proposed change

This removes the explicit pyserial and pyserial-asyncio-fast dependencies we had (for some reason).

Additional information

Zigpy (and thus ZHA) exclusively use Serialx now after the following PRs:

• Bump zigpy from 1.2.2 to 1.3.0 #743 / Switch serial to serialx zigpy#1815
• Bump zigpy-znp from 0.14.3 to 1.0.0 #744
• Bump zigpy-zigate from 0.13.4 to 0.14.0 #745

[puddly]

Oops, I didn't know we had these. Thanks for the catch.

[Copilot]

Pull request overview

Removes explicit pyserial / pyserial-asyncio-fast declarations from ZHA’s packaging metadata now that serial support is provided via zigpy’s switch to Serialx (and its transitive dependencies).

Changes:

• Drop pyserial==3.5 from pyproject.toml project dependencies
• Drop pyserial-asyncio-fast from pyproject.toml project dependencies

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.63%. Comparing base (650e08a) to head (f9b17cb).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #746   +/-   ##
=======================================
  Coverage   97.63%   97.63%           
=======================================
  Files          62       62           
  Lines       10814    10814           
=======================================
  Hits        10558    10558           
  Misses        256      256           

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