Add typing hints to simplexml

2 jobs for type-simplexml in 4 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #16449
run-test

00:00:04

 
  Build
skipped #16450
run-build
 
Name Stage Failure
failed
run-test Test
  File "/home/gitlab-runner/builds/c0eaa480/0/linkmauve/python-nbxmpp/test/unit/test_jid_parsing.py", line 51, in test_invalid_jids
JID(jid)
AssertionError: DomainpartNotAllowedChar not raised

----------------------------------------------------------------------
Ran 32 tests in 0.047s

FAILED (failures=1)
ERROR: Job failed: exit status 1