Update dependencies - spring boot 4 and angular 21 (#10)

Co-authored-by: Florian THIERRY
Reviewed-on: #10

frontend/src/app/pages/signin/signin.component.ts

@@ -10,18 +10,17 @@ import { SubmitButtonComponent } from "../../components/submit-button/submit-but
 import { MatRippleModule } from '@angular/material/core';
 
 @Component({
-  selector: 'app-signin',
-  standalone: true,
-  templateUrl: './signin.component.html',
-  styleUrl: './signin.component.scss',
-  imports: [
-    MatIconModule, 
-    MatRippleModule,
-    ReactiveFormsModule, 
-    RouterModule, 
-    SubmitButtonComponent
-  ],
-  providers: [SigninService, LoginService]
+    selector: 'app-signin',
+    templateUrl: './signin.component.html',
+    styleUrl: './signin.component.scss',
+    imports: [
+        MatIconModule,
+        MatRippleModule,
+        ReactiveFormsModule,
+        RouterModule,
+        SubmitButtonComponent
+    ],
+    providers: [SigninService, LoginService]
 })
 export class SigninComponent implements OnInit, OnDestroy {
   private signinService = inject(SigninService);