fix type errors in hub tests

Author: lobsterkatie

packages/hub/test/global.test.ts

@@ -1,5 +1,9 @@
+import { getGlobalObject } from '@sentry/utils';
+
 import { getCurrentHub, getHubFromCarrier, Hub } from '../src';
 
+const global = getGlobalObject();
+
 describe('global', () => {
   test('getGlobalHub', () => {
     expect(getCurrentHub()).toBeTruthy();