chore(ng13): bump ng-packagr to 12

Author: christopherthielen

package.json

@@ -66,7 +66,7 @@
     "husky": "^5.1.2",
     "jest": "26.6.3",
     "jest-preset-angular": "8.4.0",
-    "ng-packagr": "^10.0.0",
+    "ng-packagr": "^12.0.0",
     "prettier": "^2.0.5",
     "pretty-quick": "^3.1.0",
     "rxjs": "^6.5.4",