Switch to Doctrine's Coding Standard

DMS Coding standard has not gotten attention, so we can just default to
using vanilla Doctrine Standard, but disabling the rules that affect
backwards compatibility.

composer.json

@@ -13,9 +13,6 @@
             "email": "[email protected]"
         }
     ],
-    "require-dev": {
-        "dms/coding-standard": "^9"
-    },
     "autoload": {
         "files": ["assertarraysubset-autoload.php"]
     },
@@ -28,5 +25,8 @@
         "allow-plugins": {
             "dealerdirect/phpcodesniffer-composer-installer": true
         }
+    },
+    "require-dev": {
+        "doctrine/coding-standard": "^9 || ^12.0"
     }
 }