build(deps): bump postcss, grunt-stylelint, stylelint, stylelint-config-sass-guidelines and stylelint-scss#2394

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dependabot/npm_and_yarn/postcss-and-grunt-stylelint-and-stylelint-and-stylelint-config-sass-guidelines-and-stylelint-scss-8.4.31bigcommerce/cornerstone:dependabot/npm_and_yarn/postcss-and-grunt-stylelint-and-stylelint-and-stylelint-config-sass-guidelines-and-stylelint-scss-8.4.31Copy head branch name to clipboard