fix: use ecs and fix some contao 5.0 problems

Author: gschrisstadler

.gitignore

@@ -1,5 +1,6 @@
 # Composer
 /vendor/
+/composer.lock
 
 # PhpUnit
 /.phpunit.result.cache

composer.json

@@ -11,15 +11,13 @@
 	"require": {
 		"php": "^8.1",
 		"ext-curl": "*",
-		"contao/core-bundle": "^5.0",
-		"symfony/config": "^6.4 || ^7.4",
-		"symfony/dependency-injection": "^6.4 || ^7.4",
+		"contao/core-bundle": "^5.3",
 		"symfony/http-kernel": "^6.4 || ^7.4"
 	},
 	"require-dev": {
 		"bamarni/composer-bin-plugin": "^1.8",
 		"contao/manager-plugin": "^2.3.1",
-		"phpunit/phpunit": "^9.6",
+		"phpunit/phpunit": "^9.5",
 		"roave/security-advisories": "dev-latest",
 		"symfony/phpunit-bridge": "^6.4 || ^7.4"
 	},