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

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

frontend/src/app/components/submit-button/submit-button.component.ts

@@ -1,18 +1,16 @@
-import { CommonModule } from "@angular/common";
+
 import { Component, EventEmitter, Input, Output } from "@angular/core";
 import { MatRippleModule } from "@angular/material/core";
 import { MatProgressSpinnerModule } from "@angular/material/progress-spinner";
 
 @Component({
     selector: 'app-submit-button',
-    standalone: true,
     templateUrl: 'submit-button.component.html',
     styleUrl: 'submit-button.component.scss',
     imports: [
-        CommonModule,
-        MatRippleModule,
-        MatProgressSpinnerModule
-    ]
+    MatRippleModule,
+    MatProgressSpinnerModule
+]
 })
 export class SubmitButtonComponent {
     @Input() requestPending: boolean = false;