Stylelint 16 Support

[dons20]

Would like to use this plugin in version 16, and it probably requires an update to ESM. https://stylelint.io/migration-guide/to-16#deprecated-commonjs-api

Current error:

Error: Cannot find module '{redacted}/frontend/node_modules/stylelint/lib/utils/isStandardSyntaxAtRule.js'
    at createEsmNotFoundErr (node:internal/modules/cjs/loader:1098:15)
    at finalizeEsmResolution (node:internal/modules/cjs/loader:1091:15)
    at resolveExports (node:internal/modules/cjs/loader:567:14)
    at Module._findPath (node:internal/modules/cjs/loader:636:31)
    at Module._resolveFilename (node:internal/modules/cjs/loader:1063:27)
    at Module._load (node:internal/modules/cjs/loader:922:27)
    at Module.require (node:internal/modules/cjs/loader:1143:19)
    at require (node:internal/modules/cjs/helpers:119:18)
    at Object.<anonymous> ({redacted}/frontend/node_modules/stylelint-csstree-validator/cjs/index.cjs:4:32)
    at Module._compile (node:internal/modules/cjs/loader:1256:14)

[carlosjeurissen]

#59 adds stylelint v16 support.

[carlosjeurissen]

@dons20 @louh @AllanChain @xiaoxiangmoe @rgant @ChrisBews
pushed the v16 supported version to npm for the time being until we can get this merged.
https://www.npmjs.com/package/@carlosjeurissen/stylelint-csstree-validator