build: upgrade to angular v12

src/app/modules/storage/storage.module.ts

@@ -13,7 +13,7 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {NgModule} from '@angular/core';
-import {IonicStorageModule} from '@ionic/storage';
+import {IonicStorageModule} from '@ionic/storage-angular';
 import {StorageProvider} from './storage.provider';
 
 /**

src/app/modules/storage/storage.provider.spec.ts

@@ -48,10 +48,10 @@ describe('StorageProvider', () => {
   });
 
   it('should call ready method of storage on init', () => {
-    spyOn(storage, 'ready');
+    spyOn(storage, 'create');
     storageProvider.init();
 
-    expect(storage.ready).toHaveBeenCalled();
+    expect(storage.create).toHaveBeenCalled();
   });
 
   it('should call set method of storage to put a value', () => {

src/app/modules/storage/storage.provider.ts

@@ -102,8 +102,8 @@ export class StorageProvider {
   /**
    * Initializes the storage (waits until it's ready)
    */
-  async init(): Promise<any> {
-    return this.storage.ready();
+  async init(): Promise<void> {
+    await this.storage.create();
   }
 
   /**