Update PHPStan packages to v2

| datasource | package                           | from    | to     |
| ---------- | --------------------------------- | ------- | ------ |
| packagist  | phpstan/phpstan                   | 1.12.11 | 2.1.20 |
| packagist  | phpstan/phpstan-deprecation-rules | 1.2.1   | 2.0.3  |
| packagist  | phpstan/phpstan-phpunit           | 1.4.1   | 2.0.7  |
| packagist  | phpstan/phpstan-strict-rules      | 1.6.1   | 2.0.6  |

Author: renovate[bot]

composer.json

@@ -29,10 +29,10 @@
         "lcobucci/coding-standard": "^11.0.0",
         "monolog/monolog": "^3.4.0",
         "phpstan/extension-installer": "^1.3.1",
-        "phpstan/phpstan": "^1.10.24",
-        "phpstan/phpstan-deprecation-rules": "^1.1.3",
-        "phpstan/phpstan-phpunit": "^1.3.13",
-        "phpstan/phpstan-strict-rules": "^1.5.1",
+        "phpstan/phpstan": "^2.0.0",
+        "phpstan/phpstan-deprecation-rules": "^2.0.0",
+        "phpstan/phpstan-phpunit": "^2.0.0",
+        "phpstan/phpstan-strict-rules": "^2.0.0",
         "phpunit/phpunit": "^9.6.9"
     },
     "autoload": {