Update Kubernetes Support Matrix for 2.9.x

[cppwfs]

Update K8's support matrix in Deployer documentation.
Verify microsite and SCDF reference doc matrix's are correct.

[cppwfs]

@corneil Have the documentation been updated?

[onobc]

The only other location I found the matrix was in the Microsite (here).

Update Microsite here spring-io/dataflow.spring.io@130884c

[onobc]

Closed via spring-io/dataflow.spring.io@130884c