Bump K3s version for v1.28

[brandond]

Proposed Changes

Updates k3s: k3s-io/k3s@f575a05...96ebb96

Types of Changes

version bump

Verification

See linked issues

Testing

Linked Issues

• rke2-server concurrency issue with big clusters and rke2-agent-load-balancer misbehave #4975
• [BUG] rke2 initial auto ETCD snapshot created with 0B data, unable to restore to snapshot #5008
• Unable to cluster-reset-restore on node previously deleted from cluster with annotation #5033
• [RFE] Mechanism to easily determine etcd node health/voter status #5034
• Failed bootstrapping of node leads to certificate mismatches #5048

User-Facing Change

Containerd may now be configured to use rdt or blockio configuration by defining `rdt_config.yaml` or `blockio_config.yaml` files.
Disable helm CRD installation for disable-helm-controller
Omit snapshot list configmap entries for snapshots without extra metadata
Add jitter to client config retry to avoid hammering servers when they are starting up

Further Comments

[cadmuxe]

Hey Brad, do you have any plan to support disable-apiserver-lb flag in RKE2?
Thanks.