Bump copy-webpack-plugin from 5.0.3 to 5.0.4

Bumps [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) from 5.0.3 to 5.0.4.
- [Release notes](https://github.com/webpack-contrib/copy-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/copy-webpack-plugin/compare/v5.0.3...v5.0.4)

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

package.json

@@ -54,7 +54,7 @@
     "buble-loader": "^0.5.1",
     "chaikin-smooth": "^1.0.4",
     "clean-css-cli": "4.3.0",
-    "copy-webpack-plugin": "^5.0.3",
+    "copy-webpack-plugin": "^5.0.4",
     "coveralls": "3.0.7",
     "eslint": "^6.0.0",
     "eslint-config-openlayers": "^12.0.0",