Update k8s-kubectl image

[mikery]

The arm64 image for k8s-kubectl:v1.21.3 is broken:

$ docker run --entrypoint=/bin/sh --rm -ti lachlanevenson/k8s-kubectl:v1.21.3 
~ # cat `which kubectl`
<?xml version='1.0' encoding='UTF-8'?><Error><Code>NoSuchKey</Code><Message>The specified key does not exist.</Message><Details>No such object: kubernetes-release/release/v1.21.3/bin/linux/aarch64/kubectl</Details></Error>~ # 

The issue is fixed in v1.25.4:

$ docker run --entrypoint=/bin/sh --rm -ti lachlanevenson/k8s-kubectl:v1.25.4
~ # kubectl version
WARNING: This version information is deprecated and will be replaced with the output from kubectl version --short.  Use --output=yaml|json to get the full version.
Client Version: version.Info{Major:"1", Minor:"25", GitVersion:"v1.25.4", GitCommit:"872a965c6c6526caa949f0c6ac028ef7aff3fb78", GitTreeState:"clean", BuildDate:"2022-11-09T13:36:36Z", GoVersion:"go1.19.3", Compiler:"gc", Platform:"linux/arm64"}
Kustomize Version: v4.5.7

This PR sets v1.25.4 as the default in all values.yaml files.

[barnabasbusa]

Closing in favor of #301