Allow laminas-code ^4

Author: nicolas-grekas

composer.json

@@ -27,7 +27,7 @@
     },
     "require": {
         "php":                       ">=7.1",
-        "laminas/laminas-code":      "^3.4.1",
+        "laminas/laminas-code":      "^3.4.1|^4.0",
         "symfony/filesystem":        "^4.4.17|^5.0"
     },
     "conflict": {