Bump json5, webpack and webpack-cli

Removes [json5](https://github.com/json5/json5). It's no longer used after updating ancestor dependencies [json5](https://github.com/json5/json5), [webpack](https://github.com/webpack/webpack) and [webpack-cli](https://github.com/webpack/webpack-cli). These dependencies need to be updated together.


Removes `json5`

Updates `webpack` from 4.39.1 to 5.75.0
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v4.39.1...v5.75.0)

Updates `webpack-cli` from 3.3.6 to 5.0.1
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/v3.3.6...webpack-cli@5.0.1)

---
updated-dependencies:
- dependency-name: json5
  dependency-type: indirect
- dependency-name: webpack
  dependency-type: direct:development
- dependency-name: webpack-cli
  dependency-type: direct:development
...

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

package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "ejs": "^2.6.2",
     "express": "^4.17.1",
-    "webpack": "^4.39.1",
-    "webpack-cli": "^3.3.6"
+    "webpack": "^5.75.0",
+    "webpack-cli": "^5.0.1"
   }
 }