[Bug]: EOL Next.js 14

### What happened?

Next.js v14 reached End of Life on October 26, 2025, leading to potential security issues, see [here](https://nextjs.org/support-policy). 
Is an upgrade already planned? :) 

### Relevant log output

```shell

```

### Are you a ML Ops Team?

No

### What LiteLLM version are you on ?

v1.78.5

### Twitter / LinkedIn details

_No response_