Update dependency eslint-plugin-testing-library to v4.12.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-plugin-testing-library	4.12.2 -> 4.12.3

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Release Notes

testing-library/eslint-plugin-testing-library

### [`v4.12.3`](https://togithub.com/testing-library/eslint-plugin-testing-library/releases/v4.12.3) [Compare Source](https://togithub.com/testing-library/eslint-plugin-testing-library/compare/v4.12.2...v4.12.3) ##### Bug Fixes - **prefer-explicit-assert:** check property existence ([#​476](https://togithub.com/testing-library/eslint-plugin-testing-library/issues/476)) ([1949a93](https://togithub.com/testing-library/eslint-plugin-testing-library/commit/1949a93fbb501612f85026f1aa1e929f8f0b95bc))

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[elliotcourant]

bors r+

[bors[bot]]

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