[release-1.12] Bump Istio v1.19.6

[dprotaso]

• bump istio v1.19.6

[knative-prow]

@dprotaso: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
latest_net-istio_main	72c5885	link	true	/test latest
latest-mesh_net-istio_main	72c5885	link	true	/test latest-mesh
build-tests_net-istio_main	72c5885	link	true	/test build-tests
unit-tests_net-istio_main	72c5885	link	true	/test unit-tests
integration-tests_net-istio_main	72c5885	link	true	/test integration-tests

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[knative-prow]

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This pull-request has been approved by: dprotaso

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (230378a) 81.66% compared to head (72c5885) 81.66%.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.12    #1238   +/-   ##
=============================================
  Coverage         81.66%   81.66%           
=============================================
  Files                19       19           
  Lines              1680     1680           
=============================================
  Hits               1372     1372           
  Misses              220      220           
  Partials             88       88           

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