Update dependency i18next to v21.9.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
i18next (source)	21.9.0 -> 21.9.1

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Release Notes

i18next/i18next

### [`v21.9.1`](https://togithub.com/i18next/i18next/blob/HEAD/CHANGELOG.md#​2191) [Compare Source](https://togithub.com/i18next/i18next/compare/v21.9.0...v21.9.1) - defaultNS can now also be set to false

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