ZCU-DATA/test(static-page): type HtmlContentService spy (review nit)

Use jasmine.SpyObj<HtmlContentService> instead of `any` for the test spy,
per Copilot review.

Refs dataquest-dev/dspace-customers#566

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Matus Kasak

src/app/static-page/static-page.component.spec.ts

@@ -18,7 +18,7 @@ describe('StaticPageComponent', () => {
   let component: StaticPageComponent;
   let fixture: ComponentFixture<StaticPageComponent>;
 
-  let htmlContentService: any;
+  let htmlContentService: jasmine.SpyObj<HtmlContentService>;
   let localeService: any;
   let responseService: jasmine.SpyObj<ServerResponseService>;
   let appConfig: any;