In May 2023 (or before z2jh 3.0.0 release?) - drop support for k8s 1.22

[consideRatio]

This is an issue to help us remember the policy (see #2591, #2979) to allow ourselves to drop support for k8s versions as long as major cloud providers has stopped supporting them.

k8s	GKE EOL	EKS EOL	AKS EOL	Comment
1.22	28 Feb 2023	01 May 2023	Dec 2022	We can dro support 01 May 2023
1.23	31 May 2023	01 Oct 2023	Apr 2023	We can drop support 01 Oct 2023

I suggest drop support as part of the z2jh 3.0.0 release if it happens before 01 May. At worst someone will be forced to upgrade the k8s cluster a month or so before it reached EOL in the managed cloud provider service if they want to update to the new z2jh version directly as well.

The key benefit of dropping a bit earlier is that we reduce complexity for maintenance of this helm chart, and that we avoid making another breaking release.