chore(deps): update dependency @sourcegraph/prettierrc to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@sourcegraph/prettierrc	^2.2.0 -> ^3.0.3
prettier (source)	^1.19.1 -> ^2.8.1

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Codecov Report

Merging #54 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   42.69%   42.69%           
=======================================
  Files           4        4           
  Lines          89       89           
  Branches       18       18           
=======================================
  Hits           38       38           
  Misses         51       51

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