build(deps): bump zod from 4.4.3 to 4.6.6

Bumps [zod](https://github.com/colinhacks/zod) from 4.4.3 to 4.6.6.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](colinhacks/zod@v4.4.3...v4.6.6)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.6.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -19,7 +19,7 @@
     "@tsndr/cloudflare-worker-jwt": "^3.2.3",
     "itty-router": "^5.0.24",
     "rfc4648": "^1.5.4",
-    "zod": "^4.4.3"
+    "zod": "^4.6.6"
   },
   "devDependencies": {
     "@cloudflare/vitest-pool-workers": "^0.21.3",