Fix symfony/http-kernel CVE

Author: andig

composer.json

@@ -5,7 +5,7 @@
     "require": {
         "php-pm/php-pm": "^2.0",
         "symfony/http-foundation": "^4.2.12|^5.0|^6.0",
-        "symfony/http-kernel": "^4.0|^5.0|^6.0",
+        "symfony/http-kernel": "^4.0|^5.1.5|^6.0",
         "guzzlehttp/psr7": "^1.5|^2.0"
     },
     "require-dev": {