chore(deps): update dependency phpstan/phpstan-phpunit to v1.4.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpstan/phpstan-phpunit	1.4.0 -> 1.4.1

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Release Notes

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

v1.4.1

Compare Source

• 11d4235 - fix: Make sure Assert::assertIsList correctly asserts an array as list
• 3cc8554 - Fixes after PHPStan update
• 09e2d3b - Uncover everything behind the bleedingEdge flag
• 4d861e0 - Fix after TypeSpecifier BC break
• 3faa605 - Update build-cs
• 953195d - Stop testing PHP 7.2 and 7.3
• 7f1457f - Open 2.0.x

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