fix: run tests in sequential suite sequentially with sequence.concurrent

[dsyddall]

Description

Fixes #4473

Currently, when running Vitest with the --sequence.concurrent CLI option or with the sequence.concurrent config option set to true, describe.sequential has no effect and tests run concurrently.

This PR fixes the issue by correcting a typo causing the sequential option to not be passed to the task collector.

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[dsyddall]

Merged with #4482