Merge branch 'renovate/pyyaml-6.x' into 'master'

Update dependency pyyaml to v6

See merge request openappstack/openappstack!542

requirements.txt

@@ -92,7 +92,7 @@ python-dateutil==2.8.2
     # via kubernetes
 pytz==2021.3
     # via greenhost-cloud
-pyyaml==5.4.1
+pyyaml==6.0
     # via
     #   ansible
     #   kubernetes