Angular upgrade

	- Upgraded Angular from 14 to 15 version.

Change-Id: I2339a04020153cbc9ed7a14bfe8e0aa265e507da
Signed-off-by: SANDHYA.JS <sandhya.j@tataelxsi.co.in>
diff --git a/src/app/utilities/ns-instances-action/NSInstancesActionComponent.ts b/src/app/utilities/ns-instances-action/NSInstancesActionComponent.ts
index 08e5e97..1582bc4 100644
--- a/src/app/utilities/ns-instances-action/NSInstancesActionComponent.ts
+++ b/src/app/utilities/ns-instances-action/NSInstancesActionComponent.ts
@@ -18,7 +18,6 @@
 /**
  * @file NS InstancesAction Component
  */
-import { isNullOrUndefined } from 'util';
 import { ChangeDetectionStrategy, ChangeDetectorRef, Component, Injector } from '@angular/core';
 import { Router } from '@angular/router';
 import { NgbModal, NgbModalRef } from '@ng-bootstrap/ng-bootstrap';
@@ -35,7 +34,7 @@
 import { RestService } from 'RestService';
 import { forkJoin, Observable } from 'rxjs';
 import { ScalingComponent } from 'ScalingComponent';
-import { SharedService } from 'SharedService';
+import { SharedService, isNullOrUndefined } from 'SharedService';
 import { ShowInfoComponent } from 'ShowInfoComponent';
 import { StartStopRebuildComponent } from 'StartStopRebuildComponent';
 import { VerticalScalingComponent } from 'VerticalScalingComponent';