Bump i18next from 21.8.16 to 21.9.0 in /Plan/react/dashboard

[dependabot[bot]]

Bumps i18next from 21.8.16 to 21.9.0.

Release notes

Sourced from i18next's releases.

v21.9.0

• Add Customizable Retry Logic 1810
• types: extend compatibilityJSON with v4

Changelog

Sourced from i18next's changelog.

21.9.0

• Add Customizable Retry Logic 1810
• types: extend compatibilityJSON with v4

Commits

• e3c9172 21.9.0
• 9337e10 skip long running tests
• 8eb47ca release
• 58ff147 Merge pull request #1815 from mattbjordan/customizable-retries
• 4d2d441 types: cleanup some old stuff
• 655e985 add ability to set the max number of retries and the retry interval
• 50f645f More BackendConnector.load failure tests (#1812)
• See full diff in compare view

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