Backport CVE fixes for v0.23.4

[thomasmaas]

Cherry-picks Go 1.26.4 and golang.org/x/net v0.55.0 onto release-0.23 for a v0.23.4 patch release.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.20%. Comparing base (5006dbd) to head (923830f).

Additional details and impacted files

@@              Coverage Diff              @@
##           release-0.23     #343   +/-   ##
=============================================
  Coverage         57.20%   57.20%           
=============================================
  Files                13       13           
  Lines              1458     1458           
=============================================
  Hits                834      834           
  Misses              529      529           
  Partials             95       95           

Flag	Coverage Δ
unit	57.20% <ø> (ø)

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