Update phpstan/phpstan requirement from ^1.10.15 to ^1.10.15 || ^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@1.10.15...2.0.1)

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

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

Author: dependabot[bot]

composer.json

@@ -42,7 +42,7 @@
 	"require-dev": {
 		"phpunit/phpunit": "^9.6.8",
 		"vimeo/psalm": "^5.12.0",
-		"phpstan/phpstan": "^1.10.15",
+		"phpstan/phpstan": "^1.10.15 || ^2.0.0",
 		"mediawiki/mediawiki-codesniffer": "^44.0.0 || ^45.0.0",
 		"slevomat/coding-standard": "^v8.11.1"
 	},