[skip ci] add v4.2.0 changelog (#4215)

* [skip ci] add v4.2.0 changelog

* [skip ci] update CHANGELOG.md

* fix typo

* [skip ci]

Author: iChenLei

CHANGELOG.md

@@ -1,5 +1,12 @@
 ## Change Log
 
+### v4.2.0 (2023-08-06)
+- [#3811](https://github.com/less/less.js/pull/3811) add support for [container queries](https://www.w3.org/TR/css-contain-3) (@puckowski)
+- [#3761](https://github.com/less/less.js/pull/3761) fix faulty source map generation with variables in selectors, fixes [#3567](https://github.com/less/less.js/issues/3567) (@pgoldberg)
+- [#3700](https://github.com/less/less.js/pull/3700) parsing variables fail when there is no trailing semicolon (@b-kelly)
+- [#3719](https://github.com/less/less.js/pull/3719) modify `this` pointer so that it is not empty. (@lumburr)
+- [#3649](https://github.com/less/less.js/pull/3649) fixes [#2991](https://github.com/less/less.js/issues/2991) empty @media queries generated when compiling less file with (reference) to bootstrap (@MoonCoral)
+
 ### v4.1.3 (2022-06-09)
 - [#3673](https://github.com/less/less.js/pull/3673) Feat: add support for case-insensitive attribute selectors (#3673) (@iChenLei)
 - [#3710](https://github.com/less/less.js/pull/3701) Feat: add `disablePluginRule` flag for render() options (#3710) (@broofa @edhgoose)