Bump zod from 4.1.11 to 4.1.12

Bumps [zod](https://github.com/colinhacks/zod) from 4.1.11 to 4.1.12.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](colinhacks/zod@v4.1.11...v4.1.12)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.1.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -2,7 +2,7 @@
   "author": "",
   "dependencies": {
     "@asyncapi/bundler": "^0.6.4",
-    "zod": "^4.1.11"
+    "zod": "^4.1.12"
   },
   "description": "Schemas for NHS Notify letters bounded context",
   "devDependencies": {