object: use weakref when advancing current transition

Fixes reference count leak when activating an object and transition fails
2 jobs for memleak-fix in 1 minute and 28 seconds (queued for 1 second)
Status Job ID Name Coverage
  Container
passed container_fedora #10330966

00:00:22

 
  Build
passed build_on_fedora #10330967

00:01:05