Update dependency less to ~3.13.0 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
less (source)	~3.12.2 -> ~3.13.0

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Release Notes

less/less.js

### [`v3.13.1`](https://togithub.com/less/less.js/blob/HEAD/CHANGELOG.md#v3131-2020-12-18) [Compare Source](https://togithub.com/less/less.js/compare/v3.13.0...v3.13.1) - [#​3575](https://togithub.com/less/less.js/pull/3575) Fixes [#​3574](https://togithub.com/less/less.js/issues/3574) ([#​3575](https://togithub.com/less/less.js/issues/3575)) ([@​matthew-dean](https://togithub.com/matthew-dean)) ### [`v3.13.0`](https://togithub.com/less/less.js/blob/HEAD/CHANGELOG.md#v3130-2020-12-12) [Compare Source](https://togithub.com/less/less.js/compare/v3.12.2...v3.13.0) - [#​3572](https://togithub.com/less/less.js/pull/3572) Fixes [#​3434](https://togithub.com/less/less.js/issues/3434) - memory / runtime improvements ([#​3572](https://togithub.com/less/less.js/issues/3572)) ([@​matthew-dean](https://togithub.com/matthew-dean)) - [#​3550](https://togithub.com/less/less.js/pull/3550) Examples contain more valid CSS, to test with a new parser ([#​3550](https://togithub.com/less/less.js/issues/3550)) ([@​matthew-dean](https://togithub.com/matthew-dean)) - [#​3546](https://togithub.com/less/less.js/pull/3546) Bug fixes - fixes [#​3446](https://togithub.com/less/less.js/issues/3446) [#​3368](https://togithub.com/less/less.js/issues/3368) ([#​3546](https://togithub.com/less/less.js/issues/3546)) ([@​matthew-dean](https://togithub.com/matthew-dean))

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