refactor(core): Migrate TestBed.get to TestBed.inject (#32382)

This is cleanup/followup for PR #32200

PR Close #32382

packages/upgrade/static/testing/src/create_angularjs_testing_module.ts

@@ -93,7 +93,7 @@ export function createAngularJSTestingModule(angularModules: any[]): string {
                 imports: angularModules,
                 providers: [{provide: $INJECTOR, useValue: $injector}]
               });
-              return TestBed.get(Injector);
+              return TestBed.inject(Injector);
             }
           ])
       .name;