Update matrix.json

Author: OSPanel

extension/BuildPhpExtension/config/matrix.json

@@ -1015,7 +1015,7 @@
             "7.3": "4.2.0",
             "7.4": "4.2.0",
             "8.0": "4.2.0",
-            "8.1": "4.2.0",
+            "8.1": "",
             "8.2": "",
             "8.3": "",
             "8.4": "",