build(deps-dev): update phpstan/phpstan-phpunit requirement from ^0.12.18 to ^0.12.22 (#75)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

composer.json

@@ -23,7 +23,7 @@
         "infection/infection": "^0.21.4",
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpstan": "^0.12.99",
-        "phpstan/phpstan-phpunit": "^0.12.18",
+        "phpstan/phpstan-phpunit": "^0.12.22",
         "phpunit/phpunit": "^9.5",
         "spatie/phpunit-snapshot-assertions": "^4.2",
         "symfony/var-dumper": "^5.3",