[PiP] Bump to pipeline v0.49.0.

[fische]

Changes

The Pipelines-in-Pipelines controller is currently still depending on github.com/tektoncd/pipeline v0.20.0 and only works with the old Runs resources. This means it basically can't be used with recent versions of Tekton, as they use the new CustomRun resource.

This PR addresses this, by bumping this dependency to v0.49.0 and change the use of v1alpha1.Run to v1beta1.CustomRun.

I'm planning on opening separate PRs to support v1.PipelineRun and bring back support for podTemplate.

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Hi @fische. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[afrittoli]

/ok-to-test

[afrittoli]

@fische Thank you for this! I hope to have this functionality in tree eventually, but in the meanwhile it'd be great to have this controller in shape, much appreciated!

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afrittoli

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Needs approval from an approver in each of these files: - ~~[pipelines-in-pipelines/OWNERS](https://github.com/tektoncd/experimental/blob/main/pipelines-in-pipelines/OWNERS)~~ [afrittoli] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment