build(deps): bump zod

Bumps the production group in /services/discord-gateway with 1 update: [zod](https://github.com/colinhacks/zod).


Updates `zod` from 4.6.2 to 4.6.4
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](https://github.com/colinhacks/zod/compare/v4.6.2...v4.6.4)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production
...

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

services/discord-gateway/package.json

@@ -42,7 +42,7 @@
     "sharp": "^0.35.4",
     "tiktoken": "^1.0.22",
     "ws": "^8.21.3",
-    "zod": "^4.6.2"
+    "zod": "^4.6.4"
   },
   "devDependencies": {
     "@biomejs/biome": "latest",