fix: expand object params after ON DUPLICATE KEY UPDATE preceded by SET

[wellwelwel]

Fixes sidorares/node-mysql2#4074 (comment).

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f9859b2) to head (5451ba0).
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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #19   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          386       386           
=========================================
  Hits           386       386           

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