build(deps-dev): update phpstan/phpstan requirement from 2.0.4 to 2.1.0

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/2.1.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@2.0.4...2.1.0)

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

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

composer.json

@@ -85,7 +85,7 @@
 	"require-dev": {
 		"fig-r/psr2r-sniffer": "2.1.1",
 		"overtrue/phplint": "9.5.5",
-		"phpstan/phpstan": "2.0.4",
+		"phpstan/phpstan": "2.1.0",
 		"phpunit/phpunit": "11.5.2",
 		"phpunit/php-code-coverage": "11.0.8",
 		"rector/rector": "2.0.0",