Update rollup config

Author: rygine

packages/agent-starter/rollup.config.js

@@ -14,13 +14,13 @@ const external = [
   "@xmtp/node-bindings",
   "cross-fetch",
   "node-fetch",
-  "path",
-  "crypto",
+  "node:path",
+  "node:crypto",
   "viem",
   "dotenv",
   "viem/accounts",
-  "fs/promises",
-  "fs",
+  "node:fs/promises",
+  "node:fs",
   "viem/chains",
   "dotenv/config",
 ];