chore(deps): update dependency @sourcegraph/eslint-config to ^0.29.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@sourcegraph/eslint-config	^0.28.0 -> ^0.29.0

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

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Release Notes

sourcegraph/eslint-config

### [`v0.29.0`](https://togithub.com/sourcegraph/eslint-config/releases/v0.29.0) [Compare Source](https://togithub.com/sourcegraph/eslint-config/compare/v0.28.0...v0.29.0) ##### Features - bump jsx-a11y ([#​248](https://togithub.com/sourcegraph/eslint-config/issues/248)) ([ce8b02e](https://togithub.com/sourcegraph/eslint-config/commit/ce8b02ef817a83894c17ede3d10b13b2829df42b))

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Configuration

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