[Security vulnerability] Update dependency Kubernetes Java Client to v16

[justDo1T]

Please update Kubernetes Java Client to version 16.0.0 which underneath uses GSON in version 2.9.0.
Currently used Kubernetes Java Client in version 13.0.1 has dependendy GSON in version 2.8.7 which has a security vulnerability.

To fix this vulnerability we need GSON at least in version 2.8.9, so updating Kubernetes Java Client solves the case.

I see there is already a bot pull request to do such thing.

[sdelamo]

@timyates can you check why the associated PR is failing. Also, check the other Prs, they are all failing.