Bump js-yaml from 3.14.1 to 3.14.2 in /slides

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.14.1 to 3.14.2. - [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md) - [Commits](nodeca/js-yaml@3.14.1...3.14.2) --- updated-dependencies: - dependency-name: js-yaml dependency-version: 3.14.2 dependency-type: indirect ... Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]