Update symfony packages to v7

Author: renovate[bot]

composer.json

@@ -19,7 +19,7 @@
         "elife/ping": "^1.0",
         "jdesrosiers/silex-cors-provider": "^1.2",
         "silex/silex": "^2.0",
-        "symfony/finder": "^3.1",
+        "symfony/finder": "^7.0",
         "symfony/http-foundation": "^3.1",
         "symfony/http-kernel": "^3.1"
     },
@@ -32,8 +32,8 @@
         "justinrainbow/json-schema": "^5.1",
         "phpunit/phpunit": "^5.5",
         "squizlabs/php_codesniffer": "^3.5",
-        "symfony/filesystem": "^3.4",
-        "symfony/psr-http-message-bridge": "^1.0",
+        "symfony/filesystem": "^7.0",
+        "symfony/psr-http-message-bridge": "^7.0",
         "zendframework/zend-diactoros": "^1.3"
     },
     "config": {