Symfony 7 adjustments (#1)

Author: nuvolapl

composer.json

@@ -8,11 +8,11 @@
     "php": "^8.2",
     "ext-json": "*",
     "lcobucci/jwt": "^5.0",
-    "symfony/config": "^6.2",
-    "symfony/http-client": "^6.2",
-    "symfony/http-foundation": "^6.2",
-    "symfony/http-kernel": "^6.2",
-    "symfony/security-core": "^6.2"
+    "symfony/config": "^6.2|^7.0",
+    "symfony/http-client": "^6.2|^7.0",
+    "symfony/http-foundation": "^6.2|^7.0",
+    "symfony/http-kernel": "^6.2|^7.0",
+    "symfony/security-core": "^6.2|^7.0"
   },
   "config": {
     "optimize-autoloader": true,

src/DependencyInjection/Configuration.php

@@ -9,7 +9,7 @@
 
 final class Configuration implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('oauth2_authenticator');
         $treeBuilder->getRootNode()