chore(deps): update dependency ember-template-lint to v3.4.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-template-lint	3.4.0 -> 3.4.1

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Release Notes

ember-template-lint/ember-template-lint

### [`v3.4.1`](https://togithub.com/ember-template-lint/ember-template-lint/blob/master/CHANGELOG.md#v341-2021-05-10) [Compare Source](https://togithub.com/ember-template-lint/ember-template-lint/compare/v3.4.0...v3.4.1) ##### :bug: Bug Fix - [#​1945](https://togithub.com/ember-template-lint/ember-template-lint/pull/1945) Fixes `--clean-todo` flag to actually do the cleaning ([@​scalvert](https://togithub.com/scalvert)) ##### :memo: Documentation - [#​1900](https://togithub.com/ember-template-lint/ember-template-lint/pull/1900) Fixed typo in README ([@​MelSumner](https://togithub.com/MelSumner)) ##### Committers: 2 - Melanie Sumner ([@​MelSumner](https://togithub.com/MelSumner)) - Steve Calvert ([@​scalvert](https://togithub.com/scalvert))

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