next lint does not recognize eslint.config.mts

[baixiaoyu2997]

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/infallible-merkle-rzd64?you-dont-need=yes

To Reproduce

https://codesandbox.io/p/devbox/infallible-merkle-rzd64?you-dont-need=yes

Current vs. Expected behavior

https://codesandbox.io/p/devbox/infallible-merkle-rzd64?you-dont-need=yes

Provide environment information

Operating System:
  Platform: darwin
  Arch: x64
  Version: Darwin Kernel Version 23.6.0: Mon Jul 29 21:13:00 PDT 2024; root:xnu-10063.141.2~1/RELEASE_X86_64
  Available memory (MB): 32768
  Available CPU cores: 8
Binaries:
  Node: 22.10.0
  npm: 10.9.0
  Yarn: 1.22.22
  pnpm: 9.15.2
Relevant Packages:
  next: 15.1.4 // Latest available version is detected (15.1.4).
  eslint-config-next: 15.1.4
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.7.3
Next.js Config:
  output: export

Which area(s) are affected? (Select all that apply)

Linting

Which stage(s) are affected? (Select all that apply)

Other (Deployed)

Additional context

ref: https://eslint.org/docs/latest/use/configure/configuration-files#typescript-configuration-files

eslint support eslint.config.ts since v9.18.0, next lint not support ts config