Update the istio libraries to 1.18.7

[houshengbo]

Fixes #1646

Release Note

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b12ea7d) 79.37% compared to head (c668dc9) 79.37%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1663   +/-   ##
=======================================
  Coverage   79.37%   79.37%           
=======================================
  Files          41       41           
  Lines        1857     1857           
=======================================
  Hits         1474     1474           
  Misses        279      279           
  Partials      104      104           

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[nak3]

/lgtm

[houshengbo]

/test eventing-upgrade-tests