fix(deps): update dependency i18next to v21.6.15

This MR contains the following updates:

Package	Type	Update	Change
i18next (source)	dependencies	patch	21.6.14 -> 21.6.15

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Release Notes

i18next/i18next

v21.6.15

Compare Source

• fix hasLoadedNamespace when providing inmemory resources and a backend but partialBundledLanguages is not set

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