chore(external): bump rayfin plugin to 0.4.2 (#3741)

Pin the existing Rayfin listing to the merged 0.4.2 source commit and regenerate the marketplace catalog.

Co-authored-by: Chris Caruso <chcaruso@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/plugin/marketplace.json

@@ -1573,7 +1573,7 @@
     {
       "name": "rayfin",
       "description": "Getting-started router skill for Rayfin - scaffold a new app with the Rayfin CLI, then use the version-locked skill installed in the project.",
-      "version": "0.4.0",
+      "version": "0.4.2",
       "author": {
         "name": "Microsoft",
         "url": "https://www.microsoft.com"
@@ -1593,7 +1593,7 @@
       "source": {
         "source": "github",
         "repo": "microsoft/rayfin",
-        "ref": "plugin-v0.4.0"
+        "sha": "ed4647453c8890f874e072d669ac8b8120b9bf37"
       }
     },
     {