Update phpstan/phpstan requirement from ^0.12.88 || ^1.0.0 to ^0.12.88 || ^1.0.0 || ^2.0.0

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -120,7 +120,7 @@
         "friendsofphp/php-cs-fixer": "^3.3",
         "mpdf/mpdf": "^7.0 || ^8.0",
         "phpmd/phpmd": "^2.13",
-        "phpstan/phpstan": "^0.12.88 || ^1.0.0",
+        "phpstan/phpstan": "^0.12.88 || ^1.0.0 || ^2.0.0",
         "phpstan/phpstan-phpunit": "^1.0 || ^2.0",
         "phpunit/phpunit": ">=7.0",
         "symfony/process": "^4.4 || ^5.0",