Log Message:
Update net/erlang-xmpp to 1.1.9.

Version 1.1.9
- Deprecate jid:to_string/1 and jid:from_string/1
- Only check resource with stringprep
- Improve type specs
- Add documentation
- Add set_tr_callback/2 function
- Make it possible to uninstall translation callback
- Use translation callback in data form encoders
- Fix external codec registration for OTP 17
- Include compiler app when generating erlang.plt
- Add notes about API instability

Version 1.1.8
- Add get_meta/2 and get_meta/3
- Get rid of some dialyzer warnings

Version 1.1.7
- Generate modular code for xmpp_codec
- Improve type specs for set_from()/set_to()

Version 1.1.6
- Add xmpp:serr_unsupported_feature()
- Don't replace existing delay tag with the same 'from'