Bump webpack from 3.11.0 to 5.90.3 in /client

Bumps [webpack](https://github.com/webpack/webpack) from 3.11.0 to 5.90.3.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v3.11.0...v5.90.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

client/package.json

@@ -10,7 +10,7 @@
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-react": "^6.24.1",
-    "webpack": "3.11.0",
+    "webpack": "5.90.3",
     "webpack-dev-server": "2.11.1"
   }
 }