Update phpstan/phpstan requirement from ^2.0 to ^2.1

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/2.1.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@2.0.0...2.1.0)

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

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

composer.json

@@ -8,7 +8,7 @@
 		"composer-runtime-api": "^2.0",
 		"composer/semver": "^3.2",
 		"doctrine/dbal": "3.*",
-		"phpstan/phpstan": "^2.0"
+		"phpstan/phpstan": "^2.1"
 	},
 	"require-dev": {
 		"ext-mysqli": "*",