[release-1.27] Bump K3s version for v1.27 to fix regression in agent's supervisor port

[brandond]

Proposed Changes

Updates k3s: k3s-io/k3s@76ba9db...cb36c91

Types of Changes

bugfix

Verification

Testing

Linked Issues

• [Release-1.27] - Expose RKE2 metrics via supervisor port #6092 (comment)

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.11%. Comparing base (9c3cb32) to head (2e53b9c).
Report is 1 commits behind head on release-1.27.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.27    #6207   +/-   ##
=============================================
  Coverage         26.11%   26.11%           
=============================================
  Files                32       32           
  Lines              2684     2684           
=============================================
  Hits                701      701           
  Misses             1940     1940           
  Partials             43       43           

Flag	Coverage Δ
inttests	9.76% <ø> (ø)
unittests	18.59% <ø> (ø)

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[VestigeJ]

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