Update dependency vue-loader to v16.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
vue-loader	16.7.1 -> 16.8.1

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Release Notes

vuejs/vue-loader

### [`v16.8.1`](https://togithub.com/vuejs/vue-loader/compare/v16.8.0...v16.8.1) [Compare Source](https://togithub.com/vuejs/vue-loader/compare/v16.8.0...v16.8.1) ### [`v16.8.0`](https://togithub.com/vuejs/vue-loader/compare/v16.7.1...v16.8.0) [Compare Source](https://togithub.com/vuejs/vue-loader/compare/v16.7.1...v16.8.0)

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