Bump webpack from 3.12.0 to 5.31.2

Bumps [webpack](https://github.com/webpack/webpack) from 3.12.0 to 5.31.2.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v3.12.0...v5.31.2)

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

package.json

@@ -42,7 +42,7 @@
     "style-loader": "^0.23.1",
     "stylelint": "^13.11.0",
     "stylelint-config-standard": "^20.0.0",
-    "webpack": "^3.10.0",
+    "webpack": "^5.31.2",
     "webpack-dashboard": "^3.3.1",
     "webpack-dev-server": "^2.11.5"
   },