Upgrade angular material from 19 to 20.

frontend/src/app/components/publication-edition/publication-edition.component.ts

@@ -31,7 +31,6 @@ import { MatRippleModule } from "@angular/material/core";
         MatSelectModule,
         MatTabsModule,
         MatTooltipModule,
-        PictureSelectionDialog,
         ReactiveFormsModule,
         SubmitButtonComponent
     ],
@@ -146,4 +145,4 @@ export class PublicationEditionComponent implements OnChanges, OnDestroy {
             this.publicationEditionService.loadPreview();
         }
     }
-}
+}