src/poky:bitbake: bitbake: fix deprecated threading.Thread.setDaemon

Deprecated in Python 3.10:
https://docs.python.org/3/whatsnew/3.10.html#deprecated
python/cpython#25174

Fixes warnings like:

...bitbake/lib/bb/ui/uievent.py:68: DeprecationWarning: setDaemon() is
deprecated, set the daemon attribute instead
  self.t.setDaemon(True)

(Bitbake rev: 323f6ce27a1bfd7159e72f29684674ff495dedee)

Signed-off-by: Tim Orling <[email protected]>
Signed-off-by: Richard Purdie <[email protected]>