Bump copy-webpack-plugin from 8.1.0 to 8.1.1 in /client

Bumps [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) from 8.1.0 to 8.1.1.
- [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-contrib/copy-webpack-plugin@v8.1.0...v8.1.1)

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

Author: dependabot[bot]

client/package-lock.json

@@ -62,7 +62,7 @@
     "@babel/preset-typescript": "^7.13.0",
     "babel-loader": "^8.2.2",
     "babel-plugin-check-es2015-constants": "^6.22.0",
-    "copy-webpack-plugin": "^8.1.0",
+    "copy-webpack-plugin": "^8.1.1",
     "cross-env": "^7.0.3",
     "css-loader": "^5.2.0",
     "file-loader": "^6.2.0",