Bump webpack-dev-middleware and @vue/cli-service#12

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dependabot/npm_and_yarn/webpack-dev-middleware-and-vue/cli-service-5.3.4dhlim-dev/w3-how-to-with-vue:dependabot/npm_and_yarn/webpack-dev-middleware-and-vue/cli-service-5.3.4Copy head branch name to clipboard