Update dependency react-intl to v6.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-intl (source)	6.6.5 -> 6.6.8

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Release Notes

formatjs/formatjs (react-intl)

v6.6.8

Compare Source

Note: Version bump only for package react-intl

v6.6.7

Compare Source

Note: Version bump only for package react-intl

v6.6.6

Compare Source

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Configuration

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