feat(cache): fix version handling for #1617

[haarchri]

Signed-off-by: Christopher Paul Haar [email protected]

Description of your changes

changed version handling for cache cluster

Fixes #1617

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

added new example

kubectl get managed
NAME                                                          STATUS      READY   SYNCED   AGE
cachecluster.cache.aws.crossplane.io/aws-memcached-standard   available   True    True     19m
cachecluster.cache.aws.crossplane.io/redis-cache-cluster      available   True    True     19m

[ezgidemirel]

thanks for the PR @haarchri! LGTM