chore: update `vitepress` to 1.0.0-rc.39

[fenghan34]

Description

This PR update vitepress to 1.0.0-rc.39 to fixe the alignment of outline indicator and highlighted link, see vuejs/vitepress#3458 for more details.

https://github.com/vitest-dev/vitest/assets/59411875/6bf4abd5-0179-421e-9397-85e8a8c16d0f

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[sheremet-va]

Let's keep a single PR that updates the version at #5483