fix: ui/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-TAR-6476909
- https://snyk.io/vuln/SNYK-JS-TAR-1579147
- https://snyk.io/vuln/SNYK-JS-TAR-1579152
- https://snyk.io/vuln/SNYK-JS-TAR-1579155
- https://snyk.io/vuln/SNYK-JS-TAR-1536758

Author: snyk-bot

ui/package.json

@@ -32,7 +32,7 @@
     "classnames": "^2.2.5",
     "color": "^3.1.0",
     "cookie": "^0.3.1",
-    "copy-webpack-plugin": "^6.1.1",
+    "copy-webpack-plugin": "^7.0.0",
     "dagre": "^0.8.2",
     "deepmerge": "^3.2.0",
     "foundation-sites": "^6.4.3",