Revert "Update dependency css-minimizer-webpack-plugin to v8"#26424

MarkEWaite merged 1 commit intomasterjenkinsci/jenkins:masterfrom

revert-26413-renovate/css-minimizer-webpack-plugin-8.xjenkinsci/jenkins:revert-26413-renovate/css-minimizer-webpack-plugin-8.xCopy head branch name to clipboard