build(dev-deps): bump vitest to v4

[dsanders11]

Going to bump other dev dependencies but this was easiest to do separately since it includes test changes.

[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@​3.2.4 ⏵ 4.0.5	+1		-3	+1
	vitest@​3.2.4 ⏵ 4.0.5	+1

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