chore: bump next (#6745)

Closes #

## 🎯 Changes

What changes are made in this PR? Is it a feature or a bug fix?

<!--
Note: once you create a Pull request, we will automatically fix
auto-fixable lint issues in your branch
-->

## ✅ Checklist

- [ ] I have followed the steps listed in the [Contributing
guide](https://github.com/trpc/trpc/blob/main/CONTRIBUTING.md).
- [ ] If necessary, I have added documentation related to the changes
made.
- [ ] I have added or updated the tests related to the changes made.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Updated the "next" dependency to version ^15.3.1 across multiple
example and package projects.
- Upgraded the "zod" dependency to version ^3.24.4 throughout the
codebase.
  - Updated "eslint-config-next" to ^15.3.1 in relevant projects.
  - No changes to public APIs or user-facing functionality.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: juliusmarminge

package.json

@@ -47,14 +47,14 @@
     "@trpc/react-query": "npm:@trpc/react-query",
     "@trpc/server": "npm:@trpc/server",
     "clsx": "^2.0.0",
-    "next": "^15.1.7",
+    "next": "^15.3.1",
     "next-auth": "npm:next-auth@^4.24.11",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
     "superjson": "^1.12.4",
     "tsx": "^4.19.3",
     "ws": "^8.0.0",
-    "zod": "^3.24.2"
+    "zod": "^3.24.4"
   },
   "devDependencies": {
     "@playwright/test": "^1.50.1",
@@ -65,7 +65,7 @@
     "autoprefixer": "^10.4.7",
     "cross-env": "^7.0.3",
     "eslint": "^9.21.0",
-    "eslint-config-next": "^15.1.7",
+    "eslint-config-next": "^15.3.1",
     "eslint-plugin-react": "^7.37.2",
     "eslint-plugin-react-hooks": "^5.1.0",
     "npm-run-all": "^4.1.5",