Update dependency nativescript-vue to v2.8.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nativescript-vue	2.8.3 -> 2.8.4

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Release Notes

nativescript-vue/nativescript-vue

### [`v2.8.4`](https://togithub.com/nativescript-vue/nativescript-vue/blob/master/CHANGELOG.md#​284-httpsgithubcomnativescript-vuenativescript-vuecomparev283v284-2021-03-10) [Compare Source](https://togithub.com/nativescript-vue/nativescript-vue/compare/v2.8.3...v2.8.4) ##### Bug Fixes - child of NavigationEntry key generated in render ([#​813](https://togithub.com/nativescript-vue/nativescript-vue/issues/813)) ([#​814](https://togithub.com/nativescript-vue/nativescript-vue/issues/814)) ([ee47fc1](https://togithub.com/nativescript-vue/nativescript-vue/commit/ee47fc1d08ab6b89ff778ff305a90017cb527c44)) - incorrect nextSibling of prevSibling in appendChild/insertBefore ([#​811](https://togithub.com/nativescript-vue/nativescript-vue/issues/811)) ([5156f20](https://togithub.com/nativescript-vue/nativescript-vue/commit/5156f20b051dcd7b2e23d01eba80030f053259ad)), closes [#​809](https://togithub.com/nativescript-vue/nativescript-vue/issues/809) [#​809](https://togithub.com/nativescript-vue/nativescript-vue/issues/809)

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