fix(jsr): correct zod config

Author: RobertCraigie

Diff for: jsr.json

@@ -6,6 +6,9 @@
     "./helpers/zod": "./helpers/zod.ts",
     "./beta/realtime/websocket": "./beta/realtime/websocket.ts"
   },
+  "imports": {
+    "zod": "npm:zod@3"
+  },
   "publish": {
     "exclude": [
       "!."