Deprecate SerenityOS DSL Syntax Highlight extension (#816)

Co-authored-by: Filip Troníček <[email protected]>

Author: kleinesfilmroellchen

extension-control/extensions.json

@@ -385,6 +385,13 @@
                 "displayName": "Extension Pack for Apache Camel by Red Hat"
             }
         },
+        "kleinesfilmroellchen.serenity-dsl-syntaxhighlight": {
+            "disallowInstall": true,
+            "extension": {
+                "id": "kleinesfilmroellchen.serenity-dsl-syntaxhighlight",
+                "displayName": "SerenityOS DSL Syntax Highlight"
+            }
+        },
         "Boundary.baml-extension-preview": {
             "disallowInstall": true,
             "extension": {