Build(deps-dev): Bump phpstan/phpstan-phpunit from 1.3.15 to 1.3.16

Bumps [phpstan/phpstan-phpunit](https://github.com/phpstan/phpstan-phpunit) from 1.3.15 to 1.3.16.
- [Release notes](https://github.com/phpstan/phpstan-phpunit/releases)
- [Commits](phpstan/phpstan-phpunit@1.3.15...1.3.16)

---
updated-dependencies:
- dependency-name: phpstan/phpstan-phpunit
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -59,7 +59,7 @@
     "phpstan/phpstan": "^1.10.58",
     "phpstan/phpstan-doctrine": "^1.3.62",
     "phpstan/phpstan-strict-rules": "^1.5.2",
-    "phpstan/phpstan-phpunit": "^1.3.15",
+    "phpstan/phpstan-phpunit": "^1.3.16",
     "phpstan/extension-installer": "^1.3.1",
     "phpstan/phpstan-deprecation-rules": "^1.1",
     "guzzlehttp/guzzle": "^7.3.0",