Bump k8s dependencies

[aclevername]

Description

Bump all k8s.io imports to latest v0.19.*

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the userdocs directory)
• Manually tested
• Added labels for change area (e.g. area/nodegroup), target version (e.g. version/0.12.0) and kind (e.g. kind/improvement)
• Make sure the title of the PR is a good description that can go into the release notes

[aclevername]

@michaelbeaumont @cPu1 below is an example failure that occurs with the new k8s dependencies. Similar failures also occur in pkg/addons. From what me and @Callisto13 could tell somewhere down the stack v1 gets swapped out for __internal when parsing the resources gvk (groupVersionKind). This then leads to a failure to pass the object as its not a known version in the schema. It doesn't seem to be related to our code as this conversion happens inside either the client-go or apimachinery package.

$ ginkgo -r pkg/kubernetes/
Running Suite: /Users/jake/weave/eksctl/pkg/kubernetes/kubernetes_suite_test.go
===============================================================================
Random Seed: 1607424845
Will run 17 of 17 specs

•••
------------------------------
• Failure [0.013 seconds]
Kubernetes client wrappers
/Users/jake/weave/eksctl/pkg/kubernetes/client_test.go:16
  can create or replace missing objects
  /Users/jake/weave/eksctl/pkg/kubernetes/client_test.go:17
    can update objects that already exist [It]
    /Users/jake/weave/eksctl/pkg/kubernetes/client_test.go:18

    Unexpected error:
        <*runtime.notRegisteredErr | 0xc0002e64e0>: {
            schemeName: "pkg/runtime/scheme.go:101",
            gvk: {
                Group: "apps",
                Version: "__internal",
                Kind: "DaemonSet",
            },
            target: nil,
            t: nil,
        }
        no kind "DaemonSet" is registered for the internal version of group "apps" in scheme "pkg/runtime/scheme.go:101"
    occurred

    /Users/jake/weave/eksctl/pkg/kubernetes/client_test.go:26