Update dependency @testing-library/dom to v8.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@testing-library/dom	8.19.0 -> 8.20.0

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Release Notes

testing-library/dom-testing-library

### [`v8.20.0`](https://togithub.com/testing-library/dom-testing-library/releases/tag/v8.20.0) [Compare Source](https://togithub.com/testing-library/dom-testing-library/compare/v8.19.1...v8.20.0) ##### Features - add offline/online events ([#​1205](https://togithub.com/testing-library/dom-testing-library/issues/1205)) ([0ce0c70](https://togithub.com/testing-library/dom-testing-library/commit/0ce0c7054dfa64d1cd65053790246aed151bda9d)) ### [`v8.19.1`](https://togithub.com/testing-library/dom-testing-library/releases/tag/v8.19.1) [Compare Source](https://togithub.com/testing-library/dom-testing-library/compare/v8.19.0...v8.19.1) ##### Bug Fixes - Bump used `aria-query` types ([#​1198](https://togithub.com/testing-library/dom-testing-library/issues/1198)) ([9f363af](https://togithub.com/testing-library/dom-testing-library/commit/9f363afe6ba6b2ec9d9d11d51e3c37ab72d4576b)), closes [#​1197](https://togithub.com/testing-library/dom-testing-library/issues/1197)

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Configuration

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