chore: bump @genkit-ai/express version to @genkit-ai/[email protected]

Author: Automated Version Bump

js/plugins/express/package.json

@@ -9,7 +9,7 @@
     "genai",
     "generative-ai"
   ],
-  "version": "1.0.0-rc.12",
+  "version": "1.0.0-rc.13",
   "type": "commonjs",
   "scripts": {
     "check": "tsc",