[release-1.28] Bump K3s version for v1.28 to fix regression in agent's supervisor port

[brandond]

Proposed Changes

Updates k3s: k3s-io/k3s@b261f29...dd86a05

Types of Changes

bugfix

Verification

Testing

Linked Issues

• [Release-1.28] - Expose RKE2 metrics via supervisor port #6091 (comment)

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.09%. Comparing base (7905644) to head (9ea9097).
Report is 1 commits behind head on release-1.28.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.28    #6202   +/-   ##
=============================================
  Coverage         26.09%   26.09%           
=============================================
  Files                32       32           
  Lines              2698     2698           
=============================================
  Hits                704      704           
  Misses             1948     1948           
  Partials             46       46           

Flag	Coverage Δ
inttests	9.82% <ø> (ø)
unittests	18.57% <ø> (ø)

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[VestigeJ]

I've lost permissions again to approve on this repo which is unfortunate but LGTM