Preparation for v1.3.0 release

[swade1987]

Description

This issue holds the necessary set of changes required for the upcoming v1.3.0 release.

• [ ] PR that upgrades Flux to v2.3.0
• [x] PR that upgrades k8s to 1.30
• [ ] PR for registry creds
• [ ] PR for actual v1.3.0 release with changelog

References

No response

Would you like to implement a fix?

Yes