Upgrade: Bump copy-webpack-plugin from 5.1.1 to 6.0.3

Bumps [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) from 5.1.1 to 6.0.3.
- [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](webpack/copy-webpack-plugin@v5.1.1...v6.0.3)

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

Author: dependabot-preview[bot]

package.json

@@ -69,7 +69,7 @@
     "babel-jest": "^26.1.0",
     "babel-loader": "^8.1.0",
     "babel-preset-env": "^1.7.0",
-    "copy-webpack-plugin": "^5.1.1",
+    "copy-webpack-plugin": "^6.0.3",
     "cross-env": "^7.0.2",
     "css-loader": "^3.6.0",
     "eslint": "^6.8.0",