Update dependency i18next to v21.8.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
i18next (source)	21.6.16 -> 21.8.9

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Release Notes

i18next/i18next

v21.8.9

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• fix: deepFind for null values 1790

v21.8.8

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• fix: loadNamespaces() doesn't keep resolving order when the second request completes before the first one 1785

v21.8.7

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• fix: allow formatters having '' for string options eg. this is an {{val, array(join: ' | ’)}}

v21.8.6

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• fix: regression introduced in v21.6.11, respect appendNamespaceToMissingKey for parseMissingKeyHandler 1507

v21.8.5

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• fix: interpolation with $ in values resets nextIndex to wrong position with skipOnVariables 1782

v21.8.4

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• types: keyPrefix in react options

v21.8.3

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• prevent chrome warnings because of window.navigator.userAgent usage 1778

v21.8.2

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• types: add saveMissingPlurals option 1774

v21.8.1

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• fix regression introduced with 1768

v21.8.0

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• add maxParallelReads option, default 10 1771
• reduce CPU usage loading large numbers of items 1768

v21.7.1

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• types: missing returnDetails option in init options 1765

v21.7.0

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• introduce returnDetails option 1764

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