JS: support shortening of class private elements, fixes tdewolff#652

Merge pull request tdewolff#862 from tdewolff/dependabot/npm_and_yarn…

…/bindings/js/node-gyp-11.5.0

Bump node-gyp from 11.4.2 to 11.5.0 in /bindings/js

CSS: fix bug with custom variables starting with a digit, fixes tdewo…

…lff#861; HTML: fix bug in lowercasing template attributes

Merge pull request tdewolff#847 from jmooring/update-readme-deprecate…

…-KeepCSS2

Update CSS options in README

CSS: fix bug in CSS version, fixes tdewolff#843

Update build tags for syscalls to use //go:build

Update parse dependency

Merge pull request tdewolff#831 from tdewolff/dependabot/github_actio…

…ns/pypa/cibuildwheel-3.1.3

Bump pypa/cibuildwheel from 3.0.1 to 3.1.3

Fix tests

Update Python version