Update dependency psalm/plugin-phpunit to ^0.18.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
psalm/plugin-phpunit	require-dev	minor	^0.17.0 -> ^0.18.0

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Release Notes

psalm/psalm-plugin-phpunit

### [`v0.18.0`](https://togithub.com/psalm/psalm-plugin-phpunit/releases/tag/0.18.0) [Compare Source](https://togithub.com/psalm/psalm-plugin-phpunit/compare/0.17.0...0.18.0) #### What's Changed - \[composer.json] allow Psalm 5 beta by [@​someniatko](https://togithub.com/someniatko) in [https://github.com/psalm/psalm-plugin-phpunit/pull/122](https://togithub.com/psalm/psalm-plugin-phpunit/pull/122) - Immutable refactoring by [@​danog](https://togithub.com/danog) in [https://github.com/psalm/psalm-plugin-phpunit/pull/123](https://togithub.com/psalm/psalm-plugin-phpunit/pull/123) #### New Contributors - [@​someniatko](https://togithub.com/someniatko) made their first contribution in [https://github.com/psalm/psalm-plugin-phpunit/pull/122](https://togithub.com/psalm/psalm-plugin-phpunit/pull/122) - [@​danog](https://togithub.com/danog) made their first contribution in [https://github.com/psalm/psalm-plugin-phpunit/pull/123](https://togithub.com/psalm/psalm-plugin-phpunit/pull/123) **Full Changelog**: https://github.com/psalm/psalm-plugin-phpunit/compare/0.17.0...0.18.0

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