Update dependency terser-webpack-plugin to v1.4.6

Author: renovate[bot]

package.json

@@ -80,7 +80,7 @@
     "sass-loader": "7.2.0",
     "semver": "6.3.0",
     "style-loader": "1.0.0",
-    "terser-webpack-plugin": "1.4.1",
+    "terser-webpack-plugin": "1.4.6",
     "ts-pnp": "1.1.4",
     "url-loader": "2.1.0",
     "webpack": "4.41.2",