Update dependency prettier to ^2.1.2

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
prettier (source)	devDependencies	patch	^2.1.2	homepage, source

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Release Notes

prettier/prettier

v2.1.2

Compare Source

diff

Fix formatting for directives in fields (#​9116 by @​sosukesuzuki)

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