Update dependency prettier to v2.1.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
prettier (source)	devDependencies	patch	2.1.1 -> 2.1.2

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Release Notes

prettier/prettier

### [`v2.1.2`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#​212) [Compare Source](https://togithub.com/prettier/prettier/compare/2.1.1...2.1.2) [diff](https://togithub.com/prettier/prettier/compare/2.1.1...2.1.2) ##### Fix formatting for directives in fields ([#​9116](https://togithub.com/prettier/prettier/pull/9116) by [@​sosukesuzuki](https://togithub.com/sosukesuzuki)) ```graphql ```

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Branch automerge failure

This PR was configured for branch automerge, however this is not possible so it has been raised as a PR instead.

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[coveralls]

Coverage remained the same at 96.824% when pulling 286a45296a2613f952051e4931c920f7bad877ed on renovate/prettier-2.1.x into 97cbaeced4cc3b42dcb1f1fc05f57a6532fc3da8 on 4.x.