Fix app-types-exp import

Author: hsubox76

packages-exp/functions-types-exp/index.d.ts

@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import { FirebaseApp } from '@firebase/app-types-exp';
+import { FirebaseApp } from '@firebase/app-exp';
 import { FirebaseError } from '@firebase/util';
 
 /**