Allow symfony 7 packages (#48)

Author: FabianSchmick

.github/workflows/tests.yml

@@ -19,6 +19,8 @@ jobs:
                     - { php-version: 7.2, symfony-locked-version: none, dependency-version: prefer-lowest }
                     - { php-version: 7.4, symfony-locked-version: 4.4.*, dependency-version: prefer-stable }
                     - { php-version: 8.1, symfony-locked-version: none, dependency-version: prefer-stable }
+                    - { php-version: 8.2, symfony-locked-version: none, dependency-version: prefer-stable }
+                    - { php-version: 8.3, symfony-locked-version: none, dependency-version: prefer-stable }
         name: PHPUnit (PHP ${{matrix.php-version}}, Symfony Version Lock ${{ matrix.symfony-locked-version }}, ${{ matrix.dependency-version }})
         steps:
             -   uses: actions/checkout@v3

DependencyInjection/Configuration.php

@@ -7,7 +7,7 @@
 
 class Configuration implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('webfactory_piwik');
         if (method_exists($treeBuilder, 'getRootNode')) {

composer.json

@@ -23,9 +23,9 @@
     "require": {
         "php": ">=7.1",
         "ext-json": "*",
-        "symfony/config": "~3.0|~4.0|~5.0|~6.0",
-        "symfony/dependency-injection": "~3.0|~4.0|~5.0|~6.0",
-        "symfony/http-kernel": "~3.0|~4.0|~5.0|~6.0",
+        "symfony/config": "~3.0|~4.0|~5.0|~6.0|~7.0",
+        "symfony/dependency-injection": "~3.0|~4.0|~5.0|~6.0|~7.0",
+        "symfony/http-kernel": "~3.0|~4.0|~5.0|~6.0|~7.0",
         "twig/twig": "^1.34|^2.0|^3.0"
     },
     "require-dev": {