build: update to angular-v9.1.12 (#1215)

Fixes: #1216

src/app/notifications/notifications-page/notifications-page.component.ts

@@ -1,6 +1,8 @@
 /** Angular Imports */
 import { Component, OnInit, ViewChild } from '@angular/core';
-import { MatTableDataSource, MatPaginator, MatSort } from '@angular/material';
+import { MatPaginator } from '@angular/material/paginator';
+import { MatSort } from '@angular/material/sort';
+import { MatTableDataSource } from '@angular/material/table';
 import { ActivatedRoute } from '@angular/router';
 
 /**
@@ -38,9 +40,9 @@ export class NotificationsPageComponent implements OnInit {
   };
 
   /** Paginator for notifications table. */
-  @ViewChild(MatPaginator) paginator: MatPaginator;
+  @ViewChild(MatPaginator, { static: true }) paginator: MatPaginator;
   /** Sorter for notifications table. */
-  @ViewChild(MatSort) sort: MatSort;
+  @ViewChild(MatSort, { static: true }) sort: MatSort;
 
   /**
    * Retrieves the notifications data from `resolve`.

src/app/notifications/notifications.service.spec.ts

@@ -6,7 +6,7 @@ describe('NotificationsService', () => {
   beforeEach(() => TestBed.configureTestingModule({}));
 
   it('should be created', () => {
-    const service: NotificationsService = TestBed.get(NotificationsService);
+    const service: NotificationsService = TestBed.inject(NotificationsService);
     expect(service).toBeTruthy();
   });
 });