Prepare to release cncf.kubernetes provider

[ashb]

This one adds @task.kubernetes which we call out specifically in the 2.4.0 changelog, so lets get this one released!

(We'll follow up with a full provider release batch next week)

[potiuk]

Noting that many install Airflow with constraints so after releasing the provider we might want to manually change the constraints of 2.4.0 to include the new provider version

Or simply do 2.4.1 which I guess we are doing quickly. But yeah - you are right we can do that (and also re-build the images)