Next.js v15 is being installed with ESLint v8

[silvenon]

Link to the code that reproduces this issue

https://github.com/silvenon/repro/tree/nextjs-v15-eslint-v8

To Reproduce

1. create an app using npx create-next-app@latest
2. ensure that ESLint is set to "Yes"

Current vs. Expected behavior

Currently it installs ESLint v8, but I expected v9 considering that Next.js v15 says that it supports v9. Did I misunderstand what that meant?

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.0.0: Tue Sep 24 23:39:07 PDT 2024; root:xnu-11215.1.12~1/RELEASE_ARM64_T6000
  Available memory (MB): 16384
  Available CPU cores: 8
Binaries:
  Node: 20.18.0
  npm: 10.8.2
  Yarn: 1.22.22
  pnpm: 9.9.0
Relevant Packages:
  next: 15.0.1 // Latest available version is detected (15.0.1).
  eslint-config-next: 15.0.1
  react: 19.0.0-rc-69d4b800-20241021
  react-dom: 19.0.0-rc-69d4b800-20241021
  typescript: 5.6.3
Next.js Config:
  output: N/A

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

create-next-app, Linting

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

next dev (local), next build (local)

Additional context

No response