Bump emitted JavaScript target to ES2021

[kigawas]

No description provided.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	typescript@​5.9.3 ⏵ 6.0.2	+1		+1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6055118) to head (13ddbf2).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #891   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          166       166           
  Branches        32        32           
=========================================
  Hits           166       166           

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