Bump copy-webpack-plugin from 5.0.4 to 6.4.1

Bumps [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) from 5.0.4 to 6.4.1.
- [Release notes](https://github.com/webpack-contrib/copy-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/copy-webpack-plugin/blob/v6.4.1/CHANGELOG.md)
- [Commits](webpack/copy-webpack-plugin@v5.0.4...v6.4.1)

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

Author: dependabot-preview[bot]

package.json

@@ -34,7 +34,7 @@
     "@babel/preset-env": "^7.5.5",
     "@babel/preset-react": "^7.0.0",
     "babel-loader": "^8.0.6",
-    "copy-webpack-plugin": "^5.0.4",
+    "copy-webpack-plugin": "^6.4.1",
     "css-loader": "^4.3.0",
     "dotenv": "^8.2.0",
     "file-loader": "^4.2.0",