Update dependency eslint-plugin-testing-library to v4.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-plugin-testing-library	4.11.0 -> 4.12.0

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Release Notes

testing-library/eslint-plugin-testing-library

### [`v4.12.0`](https://togithub.com/testing-library/eslint-plugin-testing-library/releases/v4.12.0) [Compare Source](https://togithub.com/testing-library/eslint-plugin-testing-library/compare/v4.11.0...v4.12.0) ##### Features - **prefer-find-by:** report presence assertions ([#​450](https://togithub.com/testing-library/eslint-plugin-testing-library/issues/450)) ([94758f1](https://togithub.com/testing-library/eslint-plugin-testing-library/commit/94758f14b47ffadbc54c844e346c1a8477dbd3f0)), closes [#​420](https://togithub.com/testing-library/eslint-plugin-testing-library/issues/420)

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