Update dependency phpstan/phpstan-phpunit to ^1.3.16 (#592)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[phpstan/phpstan-phpunit](https://togithub.com/phpstan/phpstan-phpunit)
| `^1.3.15` -> `^1.3.16` |
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|
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|
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---

### Release Notes

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

###
[`v1.3.16`](https://togithub.com/phpstan/phpstan-phpunit/releases/tag/1.3.16)

[Compare
Source](https://togithub.com/phpstan/phpstan-phpunit/compare/1.3.15...1.3.16)

-
[d5242a5](http://github.com/phpstan/phpstan-phpunit/commit/d5242a59d035e46774f2e634b374bc39ff62cb95)
- Narrow type on assertCount and assertNotCount

</details>

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composer.json

@@ -33,7 +33,7 @@
     "php-parallel-lint/php-parallel-lint": "^1.3.2",
     "phpstan/phpstan": "^1.10.59",
     "phpstan/phpstan-deprecation-rules": "^1.1.4",
-    "phpstan/phpstan-phpunit": "^1.3.15",
+    "phpstan/phpstan-phpunit": "^1.3.16",
     "phpstan/phpstan-strict-rules": "^1.5.2",
     "phpunit/phpunit": "^10.5.10",
     "rector/rector": "^1.0.1"