Bump tmp and eslint in /packages/koa-signal

Removes [tmp](https://github.com/raszi/node-tmp). It's no longer used after updating ancestor dependency [eslint](https://github.com/eslint/eslint). These dependencies need to be updated together.


Removes `tmp`

Updates `eslint` from 6.8.0 to 9.35.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v6.8.0...v9.35.0)

---
updated-dependencies:
- dependency-name: tmp
  dependency-version: 
  dependency-type: indirect
- dependency-name: eslint
  dependency-version: 9.35.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]