Bump semver and node-sass

Bumps [semver](https://github.com/npm/node-semver) to 5.7.2 and updates ancestor dependency [node-sass](https://github.com/sass/node-sass). These dependencies need to be updated together.


Updates `semver` from 5.6.0 to 5.7.2
- [Release notes](https://github.com/npm/node-semver/releases)
- [Changelog](https://github.com/npm/node-semver/blob/v5.7.2/CHANGELOG.md)
- [Commits](npm/node-semver@v5.6.0...v5.7.2)

Updates `node-sass` from 4.11.0 to 9.0.0
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.11.0...v9.0.0)

---
updated-dependencies:
- dependency-name: semver
  dependency-type: indirect
- dependency-name: node-sass
  dependency-type: direct:production
...

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

Author: dependabot[bot]