Update dependency @sourcegraph/tslint-config to ^13.4.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
@sourcegraph/tslint-config	devDependencies	minor	^13.4.0	source

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Release Notes

sourcegraph/tslint-config

v13.4.0

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v13.3.0

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v13.2.0

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v13.1.0

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