chore: remove unused less in webpack and deps (#674)

Author: Anemy

.depcheckrc

@@ -14,11 +14,6 @@ ignores:
  - "vscode"
  - "webpack-cli"
  - "@mongodb-js/oidc-plugin"
- - css-loader
- - less
- - less-loader
  - node-loader
- - postcss-loader
- - style-loader
  - ts-loader
  - mongodb-runner