Update dependency kazoo to v2.9.0

This MR contains the following updates:

Package	Update	Change
kazoo (source, changelog)	minor	==2.8.0 -> ==2.9.0

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Release Notes

python-zk/kazoo

v2.9.0

Compare Source

LONG TIME NO SEE! Thanks a lot to everyone that contributed to this version, and to those that waited for this long due release.

Chore

• migrate to setup.cfg (#​666) (5f7ae483)
• ci:
  • testing with Python3.10 and ZK 3.5.10, 3.6.3, 3.7.1 (#​659) (bd627973)
  • better specify how to trigger Github Actions (#​658) (1ea097d5)
  • Replace Travis with Github Actions (8eb462f2)

Doc

• fix simple typo, untill -> until (85f1b5fc)

Features

• core: make DNS resolution error retriable (#​631) (e0810242)

Bug Fixes

• core:
  • use selectors to poll connections instead of raw select in threading,gevent,eventlet (#​656) (4042a850)
  • do not allow responses to choke request and ping processing (89e06603)
• recipe:
  • fix deadlock in r/w lock recipe (#​650) (9bb84994, closes #​649)
  • fix deprecation warning from threading.Event (569c89cd)

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