Bump phpstan/phpstan from 1.12.33 to 2.1.54

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-version: 2.1.54
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

composer.json

@@ -10,7 +10,7 @@
 		"phpgt/servicecontainer": "^1.3"
 	},
 	"require-dev": {
-		"phpstan/phpstan": "^1.10",
+		"phpstan/phpstan": "^2.1",
 		"phpunit/phpunit": "^10.1",
 		"phpmd/phpmd": "^2.13",
 		"squizlabs/php_codesniffer": "^4.0"