Use 5.4

Nyholm · Nyholm · commit 41bccbdda71a · 2021-05-19T15:09:07.000+02:00
diff --git a/composer.json b/composer.json
@@ -93,7 +93,7 @@
     "extra": {
         "symfony": {
             "allow-contrib": false,
-            "require": "5.3.*"
+            "require": "5.4.*"
         }
     },
     "minimum-stability": "dev",
