Update dependency vue-i18n to v9.1.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
vue-i18n	9.1.8 -> 9.1.9

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Release Notes

intlify/vue-i18n-next

### [`v9.1.9`](https://togithub.com/intlify/vue-i18n-next/releases/v9.1.9) [Compare Source](https://togithub.com/intlify/vue-i18n-next/compare/v9.1.8...v9.1.9) #### v9.1.9 (2021-10-06) ##### :bug: Bug Fixes - `vue-i18n` - [#​723](https://togithub.com/intlify/vue-i18n-next/pull/723) fix: Built-in components bugs ([@​kazupon](https://togithub.com/kazupon)) ##### Committers: 1 - kazuya kawaguchi ([@​kazupon](https://togithub.com/kazupon))

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