feat(deps): bump zod and next

Removes [zod](https://github.com/colinhacks/zod). It's no longer used after updating ancestor dependency [next](https://github.com/vercel/next.js). These dependencies need to be updated together.


Removes `zod`

Updates `next` from 13.4.19 to 13.5.6
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v13.4.19...v13.5.6)

---
updated-dependencies:
- dependency-name: zod
  dependency-type: indirect
- dependency-name: next
  dependency-type: direct:production
...

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

package.json

@@ -60,7 +60,7 @@
     "mobx": "^6.10.0",
     "mobx-react-lite": "^3.4.3",
     "moment": "^2.29.4",
-    "next": "^13.4.19",
+    "next": "^13.5.6",
     "path-to-regexp": "^6.2.1",
     "prosemirror-state": "^1.4.3",
     "react": "^18.2.0",