chore: bump genkitx-mcp version to [email protected]

Author: Automated Version Bump

js/plugins/mcp/package.json

@@ -9,7 +9,7 @@
     "genai",
     "generative-ai"
   ],
-  "version": "1.0.0-rc.12",
+  "version": "1.0.0-rc.13",
   "description": "A Genkit plugin that provides interoperability between Genkit and Model Context Protocol (MCP). Both client and server use cases are supported.",
   "main": "dist/index.js",
   "types": "./lib/index.d.ts",