Bump kind-of from 6.0.2 to 6.0.3 in /slides

Bumps [kind-of](https://github.com/jonschlinkert/kind-of) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/jonschlinkert/kind-of/releases)
- [Changelog](https://github.com/jonschlinkert/kind-of/blob/master/CHANGELOG.md)
- [Commits](jonschlinkert/kind-of@6.0.2...6.0.3)

---
updated-dependencies:
- dependency-name: kind-of
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]