Upgrade CAPO with Cluster API v1alpha4 support

[eak13]

Problem description
In an effort to keep Airship current with the latest updates of its supporting components, upgrade the CAPO (Cluster-API for OpenStack provider) the version with Cluster API v1alpha4 support when it is available. The current OpenStack Provider is v0.3.4.

CAPG github repo can be found here: https://github.com/kubernetes-sigs/cluster-api-provider-openstack

Proposed change

• Upgrade CAPO to the version with Cluster API v1alpha4 support once it has been released.
• Validate CAPO still functional as the the infra provider for OpenStack & resolve any breaking changes

[vetbijaya]

Can someone assign this to me? Thanks

[vetbijaya]

Related patchset: https://review.opendev.org/c/airship/airshipctl/+/802924