chore(deps): update dependency less-loader to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
less-loader	devDependencies	major	5.0.0 -> 6.1.0

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Release Notes

webpack-contrib/less-loader

v6.1.0

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Features

• new implementation option (#​354) (d2de80f)

Bug Fixes

• respect third-party plugins for Less (#​353) (d0db4f9)

v6.0.0

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⚠ BREAKING CHANGES

• minimum supported Node.js version is 10.13,
• minimum support webpack version is 4
• 2 version of less is not supported anymore
• using 3 versin of less by default, so you don't need to have less in your package.json, we already supply it
• move less-specific options to the lessOptions option, please look at README

Features

• the paths options now works with webpack resolver (3931470)
• allow a function to be used for lessOptions (#​325) (a6be94a)
• added the appendData option (#​336) (fb94605)
• added the prependData option (#​327) (9df8755)
• support less and style fields in package.json
• support index.less file for packages

Bug Fixes

• support import aliases without tilde (#​335) (24021cd)
• do not crash on remotely imports (#​333) (8e020e9)
• add webpack v5 support (#​317) (f0b42b4)
• first resolve an import using less resolver, then using webpack resolver (#​340) (443bd5a)
• fix a resolution for @import 'package/file.ess'; and @import './package/file.ess';

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