build: update dependency i18next to v21.2.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
i18next (source)	21.0.1 -> 21.2.0

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Release Notes

i18next/i18next

v21.2.0

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• provide bundled esm distributable 1667

v21.1.1

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• optimize natural language detection 1661

v21.1.0

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• A new RTL support added for ckb language code

v21.0.2

Compare Source

• fix defaultNS regression if translation namespace is defined in ns option, fixes #​1658

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