Bump the eslint group across 1 directory with 3 updates

Bumps the eslint group with 3 updates in the / directory: [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin), [@typescript-eslint/parser](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/parser) and [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next).


Updates `@typescript-eslint/eslint-plugin` from 8.9.0 to 8.12.1
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v8.12.1/packages/eslint-plugin)

Updates `@typescript-eslint/parser` from 8.9.0 to 8.12.1
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/parser/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v8.12.1/packages/parser)

Updates `eslint-config-next` from 14.2.15 to 15.0.1
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.0.1/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: "@typescript-eslint/eslint-plugin"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: eslint
- dependency-name: "@typescript-eslint/parser"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: eslint
- dependency-name: eslint-config-next
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: eslint
...

Signed-off-by: dependabot[bot] <[email protected]>