Bump minimatch from 3.0.2 to 3.0.8 in /slides

Bumps [minimatch](https://github.com/isaacs/minimatch) from 3.0.2 to 3.0.8.
- [Release notes](https://github.com/isaacs/minimatch/releases)
- [Commits](isaacs/minimatch@v3.0.2...v3.0.8)

---
updated-dependencies:
- dependency-name: minimatch
  dependency-type: indirect
...

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Author: dependabot[bot]