Chore: Upgraded to Angular v18

overlord/src/app/purchase-entries/purchase-entries.service.spec.ts

@@ -1,4 +1,4 @@
-import { HttpClientModule } from '@angular/common/http';
+import { provideHttpClient, withInterceptorsFromDi } from '@angular/common/http';
 import { inject, TestBed } from '@angular/core/testing';
 
 import { PurchaseEntriesService } from './purchase-entries.service';
@@ -6,8 +6,8 @@ import { PurchaseEntriesService } from './purchase-entries.service';
 describe('PurchaseEntriesService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
-      imports: [HttpClientModule],
-      providers: [PurchaseEntriesService],
+      imports: [],
+      providers: [PurchaseEntriesService, provideHttpClient(withInterceptorsFromDi())],
     });
   });