Bump html-bundler-webpack-plugin from 2.15.2 to 4.21.1

Bumps [html-bundler-webpack-plugin](https://github.com/webdiscus/html-bundler-webpack-plugin) from 2.15.2 to 4.21.1.
- [Release notes](https://github.com/webdiscus/html-bundler-webpack-plugin/releases)
- [Changelog](https://github.com/webdiscus/html-bundler-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webdiscus/html-bundler-webpack-plugin/commits)

---
updated-dependencies:
- dependency-name: html-bundler-webpack-plugin
  dependency-version: 4.21.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -80,7 +80,7 @@
     "eslint-plugin-react-hooks": "^4.2.0",
     "global-jsdom": "^26.0.0",
     "globals": "^16.4.0",
-    "html-bundler-webpack-plugin": "^2.14.0",
+    "html-bundler-webpack-plugin": "^4.21.1",
     "jsdom": "^26.1.0",
     "less": "^4.1.3",
     "mocha": "^10.0.0",