fix(@angular-devkit/build-angular): correct various vulnerability audit warnings

https://npmjs.com/advisories/1426
https://npmjs.com/advisories/961

Author: clydin

packages/angular_devkit/build_angular/package.json

@@ -15,7 +15,7 @@
     "autoprefixer": "9.4.6",
     "circular-dependency-plugin": "5.0.2",
     "clean-css": "4.2.1",
-    "copy-webpack-plugin": "4.6.0",
+    "copy-webpack-plugin": "5.1.1",
     "file-loader": "3.0.1",
     "glob": "7.1.3",
     "istanbul-instrumenter-loader": "3.0.1",
@@ -43,7 +43,7 @@
     "stylus": "0.54.5",
     "stylus-loader": "3.0.2",
     "tree-kill": "1.2.1",
-    "terser-webpack-plugin": "1.2.2",
+    "terser-webpack-plugin": "1.4.3",
     "webpack": "4.29.0",
     "webpack-dev-middleware": "3.5.1",
     "webpack-dev-server": "3.1.14",
@@ -52,7 +52,7 @@
     "webpack-subresource-integrity": "1.1.0-rc.6"
   },
   "optionalDependencies": {
-    "node-sass": "4.12.0"
+    "node-sass": "4.13.1"
   },
   "devDependencies": {
     "@angular/animations": "^7.2.0-rc.0",