chore(*): remove @types/core-js

Author: DiyanDimitrov

package-lock.json

@@ -75,7 +75,6 @@
     "@angular/compiler-cli": "^9.1.7",
     "@angular/language-service": "^9.1.7",
     "@angularclass/hmr": "^2.1.3",
-    "@types/core-js": "^2.5.3",
     "@types/jasmine": "^3.3.16",
     "@types/jasminewd2": "^2.0.8",
     "@types/node": "^12.12.39",