Bump webpack-dev-server from 3.11.2 to 4.2.1 (#2323)

* Bump webpack-dev-server from 3.11.2 to 4.2.1

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.11.2 to 4.2.1.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-dev-server/compare/v3.11.2...v4.2.1)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matthieu MOREL <mmorel-35@users.noreply.github.com>

package.json

@@ -85,7 +85,7 @@
     "terser-webpack-plugin": "^4.2.3",
     "webpack": "^4.41.2",
     "webpack-cli": "^4.7.2",
-    "webpack-dev-server": "^3.4.1",
+    "webpack-dev-server": "^4.2.1",
     "webpack-node-externals": "^3.0.0"
   },
   "files": [

webpack.config.e2e.js

@@ -51,9 +51,12 @@ module.exports = {
     libraryExport: 'default',
   },
   devServer: {
-    contentBase: [path.join(__dirname, 'cypress', 'platform'), path.join(__dirname, 'dist')],
     compress: true,
     port: 9000,
+    static: [
+      { directory: path.join(__dirname, 'cypress', 'platform') },
+      { directory: path.join(__dirname, 'dist') },
+    ],
   },
   module: {
     rules: [amdRule, jsRule, scssRule, jisonRule],