Adding conflict. See slevomat/coding-standard#1423

Author: loevgaard

composer.json

@@ -7,7 +7,10 @@
         "php": ">=7.4",
         "ergebnis/composer-normalize": "^2.27",
         "sylius-labs/coding-standard": "^4.1.1",
-        "vimeo/psalm": "^4.23"
+        "vimeo/psalm": "^4.26"
+    },
+    "conflict": {
+        "slevomat/coding-standard": "7.2.*"
     },
     "config": {
         "allow-plugins": {