Bump postcss and css-loader in /portlet/vue-portlet-webpack#23

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dependabot/npm_and_yarn/portlet/vue-portlet-webpack/postcss-and-css-loader-8.4.18exo-samples/docs-samples:dependabot/npm_and_yarn/portlet/vue-portlet-webpack/postcss-and-css-loader-8.4.18Copy head branch name to clipboard