use recent Kubernetes patch version on release-1.3

Today in release-1.3 we have:

• 1.28.15 (no new version exists)
• 1.29.11 (1.29.13 is out now)
• 1.30.7 (1.30.9 is out now)

We need to work on integrating the updates in Sylva release-1.3 branch.