Bump reveal.js from 18ec38a to f149d1f

Bumps [reveal.js](https://github.com/hakimel/reveal.js) from `18ec38a` to `f149d1f`.
- [Release notes](https://github.com/hakimel/reveal.js/releases)
- [Commits](hakimel/reveal.js@18ec38a...f149d1f)

---
updated-dependencies:
- dependency-name: reveal.js
  dependency-type: direct:production
...

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