chore(deps): update dependency psalm/plugin-phpunit to ^0.19.0 (#119)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[psalm/plugin-phpunit](https://togithub.com/psalm/psalm-plugin-phpunit)
| `^0.18.0` -> `^0.19.0` |
[![age](https://developer.mend.io/api/mc/badges/age/packagist/psalm%2fplugin-phpunit/0.19.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/packagist/psalm%2fplugin-phpunit/0.19.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/packagist/psalm%2fplugin-phpunit/0.18.4/0.19.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

<details>
<summary>psalm/psalm-plugin-phpunit (psalm/plugin-phpunit)</summary>

###
[`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
[@&#8203;sander-bol](https://togithub.com/sander-bol) in
[psalm/psalm-plugin-phpunit#128
- Replace deprecated `::set-output` by
[@&#8203;weirdan](https://togithub.com/weirdan) in
[psalm/psalm-plugin-phpunit#132
- Dependabot updates for GH actions by
[@&#8203;weirdan](https://togithub.com/weirdan) in
[psalm/psalm-plugin-phpunit#133
- Bump actions/checkout from 2 to 3 by
[@&#8203;dependabot](https://togithub.com/dependabot) in
[psalm/psalm-plugin-phpunit#134
- Bump actions/cache from 2 to 3 by
[@&#8203;dependabot](https://togithub.com/dependabot) in
[psalm/psalm-plugin-phpunit#135
- Switch to MixedReturnStatement, drop Psalm 4 support by
[@&#8203;danog](https://togithub.com/danog) in
[psalm/psalm-plugin-phpunit#142

#### New Contributors

- [@&#8203;sander-bol](https://togithub.com/sander-bol) made their first
contribution in
[psalm/psalm-plugin-phpunit#128
- [@&#8203;dependabot](https://togithub.com/dependabot) made their first
contribution in
[psalm/psalm-plugin-phpunit#134

**Full Changelog**:
psalm/psalm-plugin-phpunit@0.18.4...0.19.0

</details>

---

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composer.json

@@ -34,7 +34,7 @@
         "phpstan/phpstan-mockery": "^1.0",
         "phpstan/phpstan-phpunit": "^1.1",
         "psalm/plugin-mockery": "^1.0.0",
-        "psalm/plugin-phpunit": "^0.18.0",
+        "psalm/plugin-phpunit": "^0.19.0",
         "ramsey/coding-standard": "^2.0.3",
         "ramsey/composer-repl": "^1.4",
         "ramsey/conventional-commits": "^1.3",