bump istio and contour for gateway api testing

[dprotaso]

/assign @izabelacg

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.77%. Comparing base (e56319d) to head (8ec5cd0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15333      +/-   ##
==========================================
- Coverage   84.80%   84.77%   -0.03%     
==========================================
  Files         218      218              
  Lines       13508    13508              
==========================================
- Hits        11455    11451       -4     
- Misses       1687     1690       +3     
- Partials      366      367       +1     

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[skonto]

/lgtm
/approve

[knative-prow]

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