chore(deps): update dependency phpstan/phpstan-phpunit to v1.4.1 (#798)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[phpstan/phpstan-phpunit](https://github.com/phpstan/phpstan-phpunit)
| `1.4.0` -> `1.4.1` |
[![age](https://developer.mend.io/api/mc/badges/age/packagist/phpstan%2fphpstan-phpunit/1.4.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/packagist/phpstan%2fphpstan-phpunit/1.4.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/packagist/phpstan%2fphpstan-phpunit/1.4.0/1.4.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/packagist/phpstan%2fphpstan-phpunit/1.4.0/1.4.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>phpstan/phpstan-phpunit (phpstan/phpstan-phpunit)</summary>

###
[`v1.4.1`](https://github.com/phpstan/phpstan-phpunit/releases/tag/1.4.1)

[Compare
Source](https://github.com/phpstan/phpstan-phpunit/compare/1.4.0...1.4.1)

-
[11d4235](http://github.com/phpstan/phpstan-phpunit/commit/11d4235fbc6313ecbf93708606edfd3222e44949)
- fix: Make sure Assert::assertIsList correctly asserts an array as list
-
[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

</details>

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