chore(deps): update dependency @sourcegraph/tslint-config to ^12.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
@​sourcegraph/tslint-config	devDependencies	minor	^12.3.0	source

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Release Notes

sourcegraph/tslint-config

### [`v12.3.0`](https://renovatebot.com/gh/sourcegraph/tslint-config/compare/v12.2.0...v12.3.0) [Compare Source](https://renovatebot.com/gh/sourcegraph/tslint-config/compare/v12.2.0...v12.3.0)

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Renovate configuration

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[codecov-io]

Codecov Report

Merging #549 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #549   +/-   ##
=======================================
  Coverage   83.09%   83.09%           
=======================================
  Files          15       15           
  Lines        2058     2058           
  Branches      423      489   +66     
=======================================
  Hits         1710     1710           
  Misses        346      346           
  Partials        2        2

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[sourcegraph-bot]

:tada: This PR is included in version 2.11.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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