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
	@​vitest/​coverage-v8@​4.0.6 ⏵ 4.1.2	+1		+11
	@​types/​node@​24.10.0 ⏵ 25.5.0
	typescript@​5.9.3 ⏵ 6.0.2	+1		+1
	@​biomejs/​biome@​2.3.2 ⏵ 2.4.9	+1			+2

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b26a842) to head (6854550).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #10   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines           94        94           
  Branches        10        10           
=========================================
  Hits            94        94           

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