Restore symfony 5 support (#1403)

Restore symfony 5 support

composer.json

@@ -76,17 +76,17 @@
         "simplesamlphp/simplesamlphp-module-statistics": "^0.9",
         "simplesamlphp/simplesamlphp-module-sqlauth": "^0.9",
         "simplesamlphp/twig-configurable-i18n": "~2.3.3",
-        "symfony/cache": "^4.4",
-        "symfony/config": "^4.4",
-        "symfony/console": "^4.4",
-        "symfony/dependency-injection": "^4.4",
-        "symfony/finder": "^4.4",
-        "symfony/framework-bundle": "^4.4",
-        "symfony/http-foundation": "^4.4",
-        "symfony/http-kernel": "^4.4",
-        "symfony/routing": "^4.4",
-        "symfony/var-exporter": "^4.4",
-        "symfony/yaml": "^4.4",
+        "symfony/cache": "^4.4 || ^5.0",
+        "symfony/config": "^4.4 || ^5.0",
+        "symfony/console": "^4.4 || ^5.0",
+        "symfony/dependency-injection": "^4.4 || ^5.0",
+        "symfony/finder": "^4.4 || ^5.0",
+        "symfony/framework-bundle": "^4.4 || ^5.0",
+        "symfony/http-foundation": "^4.4 || ^5.0",
+        "symfony/http-kernel": "^4.4 || ^5.0",
+        "symfony/routing": "^4.4 || ^5.0",
+        "symfony/var-exporter": "^4.4 || ^5.0",
+        "symfony/yaml": "^4.4 || ^5.0",
         "twig/twig": "^1.43 || ^2.0"
     },
     "require-dev": {