Upgrade stylelint to version 16, adding container query support in CSS validation

[JasonWeill]

Problem

JupyterLab uses Stylelint 15, which does not support container queries, and probably other features supported by the modern browser that JupyterLab works with. PR #15948 had to suppress stylelint for these queries.

Proposed Solution

Upgrade Stylelint to v. 16, and upgrade related dependencies. Remove stylelint-config-prettier because, according to its README:

As of Stylelint v15 all style-related rules have been deprecated. If you are using v15 or higher and are not making use of these deprecated rules, this plugin is no longer necessary.

Additional context

stylelint-csstree-validator 3.0.0 does not support Stylelint 16 (csstree/stylelint-validator#58), although there is a pull request to add support for it (csstree/stylelint-validator#59). We need a new version of stylelint-csstree-validator to be able to implement this.