Bump node-sass from 4.13.1 to 7.0.3 in /web

Bumps [node-sass](https://github.com/sass/node-sass) from 4.13.1 to 7.0.3.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.13.1...v7.0.3)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]