Update dependency copy-webpack-plugin to v5.1.2

Author: renovate[bot]

package-lock.json

@@ -37,7 +37,7 @@
     "chrome-webstore-upload-cli": "1.2.0",
     "codelyzer": "5.2.0",
     "concurrently": "^5.0.1",
-    "copy-webpack-plugin": "5.1.1",
+    "copy-webpack-plugin": "5.1.2",
     "dot-json": "1.1.0",
     "eslint": "6.1.0",
     "eslint-plugin-tslint": "3.1.0",