Finish purging 'fromt typing import *' from Zulip codebase.

bots/zephyr_mirror_backend.py

@@ -21,7 +21,7 @@
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 from __future__ import absolute_import
-from typing import *
+from typing import Any, List
 
 import sys
 from six.moves import map