Bump webpack-dev-server from 4.7.2 to 4.7.3

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.7.2 to 4.7.3.
- [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/v4.7.2...v4.7.3)

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

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

package.json

@@ -70,7 +70,7 @@
     "url-loader": "^4.1.1",
     "webpack": "^5.40.0",
     "webpack-cli": "^4.9.1",
-    "webpack-dev-server": "4.7.2"
+    "webpack-dev-server": "4.7.3"
   },
   "jest": {
     "roots": [