chore(deps): update dependency plugin_platform_interface to v2.1.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
plugin_platform_interface (source)	dev_dependencies	patch	2.1.7 → 2.1.8

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Release Notes

flutter/packages (plugin_platform_interface)

v2.1.8

Compare Source

• Fixes new lint warnings.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.25%. Comparing base (c480cd6) to head (484c945).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
+ Coverage   89.69%   93.25%   +3.55%     
==========================================
  Files          11       11              
  Lines         262      252      -10     
==========================================
  Hits          235      235              
+ Misses         27       17      -10     

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