refactor #49 Drop ECS 9.0 and change to new config syntax (Zales0123)

This PR was merged into the 4.0-dev branch.

Discussion
----------

I think I did not break anything 😅 🖖 

Commits
-------

e84342c Drop ECS 9.0 and change to new config syntax

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         php: [8.0]
-        ecs: [10.*, 9.*]
+        ecs: [10.*, 11.*]
 
     steps:
       -

README.md

@@ -16,17 +16,17 @@ Installation & usage
 2. Import the configuration file in your `ecs.php`:
 
     ```php
-    $containerConfigurator->import('vendor/sylius-labs/coding-standard/ecs.php');
+    $ecsConfig->import('vendor/sylius-labs/coding-standard/ecs.php');
     ```
 
 Example config (ecs.php)
 ------------------------
 
     ```php
-    use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+    use Symplify\EasyCodingStandard\Config\ECSConfig;;
    
-    return static function (ContainerConfigurator $containerConfigurator): void {
-        $containerConfigurator->import('vendor/sylius-labs/coding-standard/ecs.php');
+    return static function (ECSConfig $ecsConfig): void {
+        $ecsConfig->import('vendor/sylius-labs/coding-standard/ecs.php');
     };
     ```
 

composer.json

@@ -12,10 +12,9 @@
     "require": {
         "php": "^8.0",
         "slevomat/coding-standard": "^7.0",
-        "symplify/easy-coding-standard": "^9.0 || ^10.0"
+        "symplify/easy-coding-standard": "^10.0 || ^11.0"
     },
     "conflict": {
-        "symplify/easy-coding-standard": ">=10.2.11",
         "symplify/package-builder": "^8.3"
     },
     "autoload-dev": {