chore: bump zod from 3.25.76 to 4.3.6 (#540)

Bumps [zod](https://github.com/colinhacks/zod) from 3.25.76 to 4.3.6.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](colinhacks/zod@v3.25.76...v4.3.6)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.3.6
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/mcp-server/package.json

@@ -26,7 +26,7 @@
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.27.1",
     "@oss-autopilot/core": "workspace:*",
-    "zod": "^3.25.0"
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@types/node": "^25.3.3",