Release v4.2.1

[puckowski]

• Update files for Release/v4.2.1.

Performed steps from comment on #4237:

1. Create a branch from master release/v4.2.1
2. Bump the Less version. (Unfortunately, this is still clunky, it's changed at package.json in root, and in /packages/less/ for historical reasons)
3. Update the Changelog
4. Run grunt dist - (Also clunky -- in a perfect world, we would not be committing dist files, but there are also tricky backwards compatibility problems which caused this initially.)
5. Commit changed files to branch.
6. Submit a PR to this repo.

Also tried to mirror #3814

I did not change the lock files. Those can be changed once the new version of Less.js is published to npm.

[matthew-dean]

@puckowski It looks like the mac test keeps timing out here:

Running "shell:runbrowser" (shell) task
http://localhost:8081/packages/less/tmp/browser/test-runner-main.html
TimeoutError: Timed out after 30000 ms while trying to connect to the browser! Only Chrome at revision r982053 is guaranteed to work.
    at Timeout.onTimeout (/Users/runner/work/less.js/less.js/packages/less/node_modules/puppeteer/lib/cjs/puppeteer/node/BrowserRunner.js:252:20)
    at listOnTimeout (node:internal/timers:569:17)
    at process.processTimers (node:internal/timers:512:7)

[matthew-dean]

@iChenLei can you take a look?

[iChenLei]

@matthew-dean This is a macos-specific issue, I think you can merge the PR first, I will investigate and fix this issue later.

[iChenLei]

@matthew-dean Hello, sir. Did you forget to release version 4.2.1 to npm?
https://www.npmjs.com/package/less