Bump intl-relativeformat from 6.4.2 to 6.4.3 (#11380)

Bumps [intl-relativeformat](https://github.com/formatjs/formatjs) from 6.4.2 to 6.4.3.
- [Release notes](https://github.com/formatjs/formatjs/releases)
- [Commits](https://github.com/formatjs/formatjs/compare/intl-relativeformat@6.4.2...intl-relativeformat@6.4.3

)

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