fix(vitest-environment): avoid vitest/environments import warning in vitest4.1

[yamachi4416]

🔗 Linked issue

📚 Description

the following warning appeared when importing vitest/environments in Vitest 4.1

Importing from "vitest/environments" is deprecated since Vitest 4.1. Please use "vitest/runtime" instead.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/nuxt/test-utils/@nuxt/test-utils@1627

npm i https://pkg.pr.new/nuxt/test-utils/vitest-environment-nuxt@1627

commit: 53c71c9