Bump gulp-less from 4.0.1 to 5.0.0 (#287)

Bumps [gulp-less](https://github.com/gulp-community/gulp-less) from 4.0.1 to 5.0.0.
- [Release notes](https://github.com/gulp-community/gulp-less/releases)
- [Changelog](https://github.com/gulp-community/gulp-less/blob/master/Changelog.md)
- [Commits](https://github.com/gulp-community/gulp-less/commits)

---
updated-dependencies:
- dependency-name: gulp-less
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -55,7 +55,7 @@
     "gulp-eslint": "^6.0.0",
     "gulp-exec": "^5.0.0",
     "gulp-header": "^2.0.5",
-    "gulp-less": "^4.0.1",
+    "gulp-less": "^5.0.0",
     "gulp-mocha": "^8.0.0",
     "gulp-stylelint": "^13.0.0",
     "jsdom": "^16.0.1",