[Release 1.35] Bump Traefik to v3.6.9

[manuelbuil]

Backport: #13693
Issue: #13696

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 21.77%. Comparing base (5505935) to head (101f5e2).
⚠️ Report is 1 commits behind head on release-1.35.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.35   #13703   +/-   ##
=============================================
  Coverage         21.76%   21.77%           
=============================================
  Files               191      191           
  Lines             15540    15540           
=============================================
+ Hits               3383     3384    +1     
+ Misses            11706    11705    -1     
  Partials            451      451           

Flag	Coverage Δ
unittests	21.77% <ø> (+<0.01%)	⬆️

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