Update dependency psalm/plugin-phpunit to ^0.19.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
psalm/plugin-phpunit	^0.18.4 -> ^0.19.0

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Release Notes

psalm/psalm-plugin-phpunit (psalm/plugin-phpunit)

### [`v0.19.0`](https://togithub.com/psalm/psalm-plugin-phpunit/releases/tag/0.19.0): Add Psalm 6 support, drop Psalm 4 support [Compare Source](https://togithub.com/psalm/psalm-plugin-phpunit/compare/0.18.4...0.19.0) This release adds support for Psalm 6, dropping support for Psalm 4. #### What's Changed - Update README.md by [@​sander-bol](https://togithub.com/sander-bol) in [https://github.com/psalm/psalm-plugin-phpunit/pull/128](https://togithub.com/psalm/psalm-plugin-phpunit/pull/128) - Replace deprecated `::set-output` by [@​weirdan](https://togithub.com/weirdan) in [https://github.com/psalm/psalm-plugin-phpunit/pull/132](https://togithub.com/psalm/psalm-plugin-phpunit/pull/132) - Dependabot updates for GH actions by [@​weirdan](https://togithub.com/weirdan) in [https://github.com/psalm/psalm-plugin-phpunit/pull/133](https://togithub.com/psalm/psalm-plugin-phpunit/pull/133) - Bump actions/checkout from 2 to 3 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/psalm/psalm-plugin-phpunit/pull/134](https://togithub.com/psalm/psalm-plugin-phpunit/pull/134) - Bump actions/cache from 2 to 3 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/psalm/psalm-plugin-phpunit/pull/135](https://togithub.com/psalm/psalm-plugin-phpunit/pull/135) - Switch to MixedReturnStatement, drop Psalm 4 support by [@​danog](https://togithub.com/danog) in [https://github.com/psalm/psalm-plugin-phpunit/pull/142](https://togithub.com/psalm/psalm-plugin-phpunit/pull/142) #### New Contributors - [@​sander-bol](https://togithub.com/sander-bol) made their first contribution in [https://github.com/psalm/psalm-plugin-phpunit/pull/128](https://togithub.com/psalm/psalm-plugin-phpunit/pull/128) - [@​dependabot](https://togithub.com/dependabot) made their first contribution in [https://github.com/psalm/psalm-plugin-phpunit/pull/134](https://togithub.com/psalm/psalm-plugin-phpunit/pull/134) **Full Changelog**: https://github.com/psalm/psalm-plugin-phpunit/compare/0.18.4...0.19.0

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