chore(deps): update stylelint and related

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/stylelint-config	devDependencies	minor	2.3.0 -> 2.6.0
stylelint-prettier	devDependencies	minor	1.1.2 -> 1.2.0

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

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Release Notes

prettier/stylelint-prettier

v1.2.0

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