Update dependency phpstan/phpstan-phpunit to v2 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpstan/phpstan-phpunit	^1.4.0 -> ^2.0.0

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Release Notes

phpstan/phpstan-phpunit (phpstan/phpstan-phpunit)

### [`v2.0.0`](https://redirect.github.com/phpstan/phpstan-phpunit/releases/tag/2.0.0) [Compare Source](https://redirect.github.com/phpstan/phpstan-phpunit/compare/1.4.0...2.0.0) - [3cc8554](http://github.com/phpstan/phpstan-phpunit/commit/3cc855474263ad6220dfa49167cbea34ca1dd300) - Fixes after PHPStan update - [09e2d3b](http://github.com/phpstan/phpstan-phpunit/commit/09e2d3b470bdda02824c626735153dfd962e3f29) - Uncover everything behind the bleedingEdge flag - [4d861e0](http://github.com/phpstan/phpstan-phpunit/commit/4d861e0843cd1f8eccacfac14e24a8629280a887) - Fix after TypeSpecifier BC break - [3faa605](http://github.com/phpstan/phpstan-phpunit/commit/3faa60573a32522772e7cda004003b15466e2b5b) - Update build-cs - [953195d](http://github.com/phpstan/phpstan-phpunit/commit/953195d722a2c38c5ee904cea31d0a91b4d8a784) - Stop testing PHP 7.2 and 7.3 - [7f1457f](http://github.com/phpstan/phpstan-phpunit/commit/7f1457f2fbea110c0a7be4a03747823f0575292f) - Open 2.0.x - [146d9c3](http://github.com/phpstan/phpstan-phpunit/commit/146d9c32a7596ade35e9426ad748ee3b0e3c2566) - Test newer PHP versions - [bb6bec0](http://github.com/phpstan/phpstan-phpunit/commit/bb6bec0008d6229e04632a46d4adb71aed63c269) - Pin build-cs

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