fix(deps): update dependency i18next to v19.9.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
i18next (source)	19.8.9 -> 19.9.1

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Release Notes

i18next/i18next

### [`v19.9.1`](https://togithub.com/i18next/i18next/blob/master/CHANGELOG.md#​1991) [Compare Source](https://togithub.com/i18next/i18next/compare/v19.9.0...v19.9.1) - Fallback on singular defaultValue [1563](https://togithub.com/i18next/i18next/pull/1563) ### [`v19.9.0`](https://togithub.com/i18next/i18next/blob/master/CHANGELOG.md#​1990) [Compare Source](https://togithub.com/i18next/i18next/compare/v19.8.9...v19.9.0) - Improve updateMissing default plural behavior [1558](https://togithub.com/i18next/i18next/pull/1558) - typescript: type definitions improvements for backend [1560](https://togithub.com/i18next/i18next/pull/1560)

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