build(deps-dev): bump less from 3.9.0 to 3.12.2 in /superset-frontend (…

…apache#11597)

Bumps [less](https://github.com/less/less.js) from 3.9.0 to 3.12.2.
- [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)

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

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

superset-frontend/package.json

@@ -257,7 +257,7 @@
     "jest-environment-enzyme": "^7.1.2",
     "jest-enzyme": "^7.1.2",
     "jsdom": "^16.2.2",
-    "less": "^3.9.0",
+    "less": "^3.12.2",
     "less-loader": "^5.0.0",
     "mini-css-extract-plugin": "^0.4.0",
     "node-fetch": "^2.6.1",