chore: update kube-stack-version

[github-actions]

This PR automatically updates the kube-stack-version in docset.yml based on the latest version from the elastic-agent repository.

Changes:

• Updated kube-stack-version to the latest value from elastic-agent repository

Generated by: Update Kube Stack Version workflow

This is an automated update. Please review the changes before merging.

[colleenmcginnis]

Who's responsible for this automation? @theletterf do you know?

[theletterf]

@colleenmcginnis I am! This one somehow escaped the census I guess.

@rogercoll Could you confirm this is correct?

[rogercoll]

Not really, we have just automated the bump in the elastic-agent repository but not in Kibana yet. That's why the elastic-agent repo (which just uses the version for testing) looks one version ahead.

Sorry for not sharing that before, that we might need to change this bump automation to point to the Kibana's file instead: https://github.com/elastic/kibana/blob/main/x-pack/solutions/observability/plugins/observability_onboarding/public/application/quickstart_flows/otel_kubernetes/constants.ts#L9

[theletterf]

Thanks Roger! Closing this one and I'll update the automation in a new PR.