Bump tmp from 0.2.1 to 0.2.4 in /cs-walkthrough/functions

Bumps [tmp](https://github.com/raszi/node-tmp) from 0.2.1 to 0.2.4.
- [Changelog](https://github.com/raszi/node-tmp/blob/master/CHANGELOG.md)
- [Commits](raszi/node-tmp@v0.2.1...v0.2.4)

---
updated-dependencies:
- dependency-name: tmp
  dependency-version: 0.2.4
  dependency-type: indirect
...

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

Author: dependabot[bot]