chore(deps-dev): bump less from 4.6.2 to 4.8.1

Bumps [less](https://github.com/less/less.js) from 4.6.2 to 4.8.1.
- [Release notes](https://github.com/less/less.js/releases)
- [Changelog](https://github.com/less/less.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/less/less.js/commits/v4.8.1)

---
updated-dependencies:
- dependency-name: less
  dependency-version: 4.8.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]