chore(deps): update nuxt typescript core packages to v2.15.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@nuxt/types	2.15.7 -> 2.15.8
nuxt	2.15.7 -> 2.15.8

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Release Notes

nuxt/nuxt.js

### [`v2.15.8`](https://togithub.com/nuxt/nuxt.js/releases/v2.15.8) [Compare Source](https://togithub.com/nuxt/nuxt.js/compare/v2.15.7...v2.15.8) ##### 🐛 Bug Fixes - `vue-app` - [#​9460](https://togithub.com/nuxt/nuxt.js/issues/9460) Don't normalise route path if it's valid - `babel` - [#​9631](https://togithub.com/nuxt/nuxt.js/issues/9631) Loose option for `babel private-property-in-object`

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