Pin CAPI provider versions in examples in docs

[jnummelin]

Currently we don't pin the versions which means we're picking up the latest. This means also often changes in CRD versions which will result in non-working examples since the APIs can change. See e.g. #1123

[github-actions]

The issue is marked as stale since no activity has been recorded in 30 days

[amueller82]

+1 - most example are not working - results into poor user-experience