fix(deps): update vueuse monorepo to v12 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@vueuse/core (source)	^11.1.0 -> ^12.0.0
@vueuse/nuxt (source)	^11.1.0 -> ^12.0.0
@vueuse/router (source)	^11.2.0 -> ^12.0.0

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Release Notes

vueuse/vueuse (@​vueuse/core)

v12.0.0

Compare Source

   🚨 Breaking Changes

• Drop Vue 2 support, optimize bundles and clean up  -  by @​antfu in https://github.com/vueuse/vueuse/issues/4349 (0a9ed)

[!NOTE]
To Vue 3 users, v12.0.0 is equivalent to v11.3.0 on behaviors, only to remove some Vue 2 specific handling and will be slightly lighter. We expect future development to contain on v12.x and forward, and only backport if there are security issues. This means that VueUse would no longer be active on Vue 2 support.

    View changes on GitHub

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