Pin figma plugin to an immutable ref (#2882)

Points the figma external plugin entry at tag v2.2.96-figquery.1 in
figma/mcp-server-guide instead of tracking the default branch, and updates
the listed version to match the plugin manifests on that tag.

Regenerates .github/plugin/marketplace.json.

.github/plugin/marketplace.json

@@ -744,7 +744,7 @@
     {
       "name": "figma",
       "description": "Plugin that includes the Figma MCP server and Skills for common workflows.",
-      "version": "1.0.0",
+      "version": "2.2.96",
       "author": {
         "name": "Figma",
         "url": "https://www.figma.com"
@@ -760,7 +760,8 @@
       "repository": "https://github.com/figma/mcp-server-guide",
       "source": {
         "source": "github",
-        "repo": "figma/mcp-server-guide"
+        "repo": "figma/mcp-server-guide",
+        "ref": "v2.2.96-figquery.1"
       }
     },
     {

plugins/external.json

@@ -524,7 +524,7 @@
   {
     "name": "figma",
     "description": "Plugin that includes the Figma MCP server and Skills for common workflows.",
-    "version": "1.0.0",
+    "version": "2.2.96",
     "author": {
       "name": "Figma",
       "url": "https://www.figma.com"
@@ -540,7 +540,8 @@
     "repository": "https://github.com/figma/mcp-server-guide",
     "source": {
       "source": "github",
-      "repo": "figma/mcp-server-guide"
+      "repo": "figma/mcp-server-guide",
+      "ref": "v2.2.96-figquery.1"
     }
   },
   {