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

Fixes: #1216

src/app/collections/collections.service.spec.ts

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

src/app/collections/individual-collection-sheet/individual-collection-sheet.component.ts

@@ -1,6 +1,9 @@
 /** Angular Imports */
 import { Component, OnInit, ViewChild } from '@angular/core';
-import { MatTableDataSource, MatPaginator, MatSort, MatDialog } from '@angular/material';
+import { MatDialog } from '@angular/material/dialog';
+import { MatPaginator } from '@angular/material/paginator';
+import { MatSort } from '@angular/material/sort';
+import { MatTableDataSource } from '@angular/material/table';
 import { FormGroup, FormBuilder, Validators } from '@angular/forms';
 import { ActivatedRoute, Router } from '@angular/router';
 import { DatePipe } from '@angular/common';