build(deps): bump postcss and @vue/cli-service in /demo/vue-cli3#45

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dependabot/npm_and_yarn/demo/vue-cli3/postcss-and-vue/cli-service-8.4.20cloydlau/json-editor-vue:dependabot/npm_and_yarn/demo/vue-cli3/postcss-and-vue/cli-service-8.4.20Copy head branch name to clipboard