Update phpstan/phpstan requirement from ^1.4.6 to ^1.4.6 || ^2.0.0

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.0.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.4.6...2.0.1)

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

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

composer.json

@@ -20,7 +20,7 @@
     },
 	"require-dev": {
 		"phpunit/phpunit": "^9.5.13",
-        "phpstan/phpstan": "^1.4.6"
+        "phpstan/phpstan": "^1.4.6 || ^2.0.0"
     },
     "autoload": {
         "psr-4": {