Fix integraion Test by upgrading Knative

[khrm]

Knative 1.6 doesn't install on the current cluster. So updated it to the latest version.

Changes

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• [ ] Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• [x] Has Tests included if any functionality added or changed
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Release Notes

NONE

[khrm]

/kind misc

[khrm]

@bigkevmcd @dibyom Please review and /lgtm to this to fix the integration test.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom, savitaashture

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[khrm]

/cherry-pick release-v0.24.x

[tekton-robot]

@khrm: new pull request created: #1655

In response to [this](https://github.com/tektoncd/triggers/pull/1616#issuecomment-1768105841): >/cherry-pick release-v0.24.x Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[khrm]

/cherry-pick release-v0.23.x

[tekton-robot]

@khrm: new pull request created: #1656

In response to [this](https://github.com/tektoncd/triggers/pull/1616#issuecomment-1768259389): > >/cherry-pick release-v0.23.x > > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.