update angular to 13.1.0

pdb-js/src/app/image-toggle/image-toggle.component.ts

@@ -17,7 +17,7 @@ export class ImageToggleComponent implements OnInit {
   
   text = undefined;
   
-  _states : Array<any>;
+  _states : Array<any> = [];
 
   constructor() { }
 
@@ -34,7 +34,7 @@ export class ImageToggleComponent implements OnInit {
     return this._states[this.index].title;
   }
 
-  toggle(event){
+  toggle(event: any){
     this.index = (this.index+1) % this._states.length;
     this.text = this._states[this.index].text;
     this.valueChanged.emit(this._states[this.index].value);