chore(deps): bump core-js from 3.4.1 to 3.6.4 (#1147)

Author: dependabot-preview[bot]

package-lock.json

@@ -42,7 +42,7 @@
     "cordova-plugin-splashscreen": "^5.0.3",
     "cordova-plugin-statusbar": "^2.4.3",
     "cordova-plugin-whitelist": "^1.3.4",
-    "core-js": "^3.4.1",
+    "core-js": "^3.6.4",
     "rxjs": "^6.5.3",
     "sw-toolbox": "3.6.0",
     "tslib": "^1.10.0",