Bump webpack-dev-server from 4.15.1 to 5.0.1

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.15.1 to 5.0.1.
- [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/v4.15.1...v5.0.1)

---
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>

config/shakapacker.yml

@@ -51,7 +51,7 @@ development:
   # Reference: https://webpack.js.org/configuration/dev-server/
   # Keys not described there are documented inline and in https://github.com/shakacode/shakapacker/
   dev_server:
-    https: false
+    server: http
     host: localhost
     port: 3035
     # Hot Module Replacement updates modules while the application is running without a full reload