Bump nth-check and renderkid in /demo

Bumps [nth-check](https://github.com/fb55/nth-check) and [renderkid](https://github.com/AriaMinaei/RenderKid). These dependencies needed to be updated together.

Updates `nth-check` from 1.0.2 to 2.1.1
- [Release notes](https://github.com/fb55/nth-check/releases)
- [Commits](fb55/nth-check@v1.0.2...v2.1.1)

Updates `renderkid` from 2.0.5 to 2.0.7
- [Release notes](https://github.com/AriaMinaei/RenderKid/releases)
- [Commits](AriaMinaei/RenderKid@2.0.5...2.0.7)

---
updated-dependencies:
- dependency-name: nth-check
  dependency-type: indirect
- dependency-name: renderkid
  dependency-type: indirect
...

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

Author: dependabot[bot]