build(deps): bump webpack-dev-server from 3.8.2 to 5.2.1#3

dependabot[bot] wants to merge 1 commit intomasterorieg/vuepress:masterfrom

dependabot/npm_and_yarn/webpack-dev-server-5.2.1orieg/vuepress:dependabot/npm_and_yarn/webpack-dev-server-5.2.1Copy head branch name to clipboard