chore(deps): update stylelint and related (major)

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/stylelint-config	devDependencies	major	2.6.0 -> 3.0.0
stylelint-prettier	devDependencies	major	1.2.0 -> 2.0.0

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

prettier/stylelint-prettier

v2.0.0

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