Update istio version for install istio-knative-extras.yaml

[MIBc]

Fixes: #2380

Proposed Changes

• Update istio version.

[knative-prow-robot]

Hi @MIBc. Thanks for your PR.

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[MIBc]

/assign @averikitsch

[sebgoa]

/ok-to-test

[sebgoa]

I would lgtm but I don't follow Istio that closely

[evankanderson]

/lgtm
/approve

cc @tcnghia We probably need to copy this back at least one or two releases -- did 0.13 have Istio 1.5 support?

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: evankanderson, MIBc

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