Bump K3s version for 2024-04 release cycle

[brandond]

Proposed Changes

Updates k3s: k3s-io/k3s@5d69d6e...3f906be

Types of Changes

version bump

Verification

See linked issues

Testing

Linked Issues

• Emit events for certificates about to expire #5620
• Etcd load-balancer on control-plane-only server may select removed etcd cluster member as default server #5646
• Stopping rke2-server service on ControlPlane node causes other nodes to go NotReady #5614
• Registry TLS configuration from registries.yaml is only honored for mirror endpoints #5658
• Add client-supervior.crt and client-supervior.key to the rotation list #5652
• Unrecoverable error when joining node attempts to retrieve etcd member list from itself #5804

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.46%. Comparing base (85cf0fb) to head (9b08aae).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5714      +/-   ##
==========================================
+ Coverage   26.04%   26.46%   +0.41%     
==========================================
  Files          30       30              
  Lines        2634     2649      +15     
==========================================
+ Hits          686      701      +15     
  Misses       1903     1903              
  Partials       45       45              

Flag	Coverage Δ
inttests	10.00% <100.00%> (+0.51%)	⬆️
unittests	18.80% <0.00%> (-0.11%)	⬇️

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