Update dependency vue-property-decorator to v8.4.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
vue-property-decorator	dependencies	patch	8.4.1 -> 8.4.2

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Release Notes

kaorun343/vue-property-decorator

### [`v8.4.2`](https://togithub.com/kaorun343/vue-property-decorator/releases/v8.4.2) [Compare Source](https://togithub.com/kaorun343/vue-property-decorator/compare/v8.4.1...v8.4.2) [#​306](https://togithub.com/kaorun343/vue-property-decorator/issues/306) Fix `@Emit` decorator

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