chore: Remove alexandear from REVIEWERS

[alexandear]

Removes me from REVIEWERS as I'm stepping back from reviewing.

Added in #3588.

[gmlewis]

Thank you, @alexandear, for your excellent reviews. Your efforts are greatly appreciated.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.53%. Comparing base (9b114ec) to head (12749cb).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4535   +/-   ##
=======================================
  Coverage   98.53%   98.53%           
=======================================
  Files         195      195           
  Lines       17875    17875           
=======================================
  Hits        17614    17614           
  Misses        261      261           

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