fix(deps): update dependency i18next to v26.0.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
i18next (source)	26.0.7 → 26.0.8

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Release Notes

i18next/i18next (i18next)

v26.0.8

Compare Source

• fix(types): restore the pre-v25.10.4 ExistsFunction shape so plain arrow functions can again be assigned to ExistsFunction-typed variables (TypeScript cannot infer type predicates through multi-overload assignment). Direct i18next.exists(key) calls still narrow key to SelectorKey — the predicate is now declared inline on i18n.exists. Custom wrappers that want the narrowing can type themselves as typeof i18next.exists 2425

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