chore(deps): update dependency @ionic-native/core to v5.21.6

Author: renovate-bot

package-lock.json

@@ -48,7 +48,7 @@
     "@angular/platform-browser": "8.2.14",
     "@angular/platform-browser-dynamic": "8.2.14",
     "@angular/router": "8.2.14",
-    "@ionic-native/core": "5.18.0",
+    "@ionic-native/core": "5.21.6",
     "@ionic-native/splash-screen": "5.18.0",
     "@ionic-native/status-bar": "5.18.0",
     "@ionic/angular": "4.11.7",