Bump webpack-dev-server to 5.0.2 (#4875)

* Bump webpack-dev-server in /{{cookiecutter.project_slug}}

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.15.1 to 5.0.2.
- [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...v5.0.2)

---
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>

* Update server proxy syntax for webpack-dev-server@v5

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Bruno Alla <alla.brunoo@gmail.com>

{{cookiecutter.project_slug}}/package.json

@@ -31,7 +31,7 @@
     "webpack": "^5.65.0",
     "webpack-bundle-tracker": "^3.0.1",
     "webpack-cli": "^5.0.1",
-    "webpack-dev-server": "^4.6.0",
+    "webpack-dev-server": "^5.0.2",
     "webpack-merge": "^5.8.0"
   },
   "engines": {

{{cookiecutter.project_slug}}/webpack/dev.config.js

@@ -6,13 +6,16 @@ module.exports = merge(commonConfig, {
   devtool: 'inline-source-map',
   devServer: {
     port: 3000,
-    proxy: {
-      {%- if cookiecutter.use_docker == 'n' %}
-      '/': 'http://0.0.0.0:8000',
-      {%- else %}
-      '/': 'http://django:8000',
-      {%- endif %}
-    },
+    proxy: [
+      {
+        context: ['/'],
+        {%- if cookiecutter.use_docker == 'n' %}
+        target: 'http://0.0.0.0:8000',
+        {%- else %}
+        target: 'http://django:8000',
+        {%- endif %}
+      },
+    ],
     client: {
       overlay: {
         errors: true,