Update stylelint* to latest releases

Problem/Motivation

Update all stylelint-related JavaScript dependencies to their latest releases.

Priority Critical, since it parent was deemed Critical

Steps to reproduce

$ yarn upgrade-interactive

Proposed resolution

? Pick the packages you want to upgrade.         Current    Range     Latest
 stylelint-config-standard ------------------- ◯ ^34.0.0 ------          ◉ ^36.0.1
 stylelint-prettier -------------------------- ◯ ^4.1.0 -------          ◉ ^5.0.2
 stylelint ----------------------------------- ◯ ^15.11.0 -----          ◉ ^16.10.0

Remaining tasks

Backport this to the gazillion current branches, TBD by the core committers.

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet