Bump copy-webpack-plugin from 6.0.3 to 6.4.1

Bumps [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) from 6.0.3 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-contrib/copy-webpack-plugin@v6.0.3...v6.4.1)

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

package.json

@@ -14,7 +14,7 @@
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "^4.15.1",
     "babel-eslint": "^10.1.0",
-    "copy-webpack-plugin": "^6.0.3",
+    "copy-webpack-plugin": "^6.4.1",
     "cross-env": "^7.0.2",
     "css-loader": "^4.2.1",
     "eslint": "^7.5.0",