Merge branch 'release-0.43.0' into develop

* release-0.43.0:
  Bumping version to 0.43.0
Update CloudFormation models
Serialize empty list query params
Bumping version to 0.44.0
Merge branch 'release-0.44.0'

* release-0.44.0:
  Bumping version to 0.44.0
  Serialize empty list query params
  Update CloudFormation models