Update dependency gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init to v0.39.0

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init	ironbank-docker	minor	v0.37.2 -> v0.39.0
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init		minor	v0.37.2 -> v0.39.0
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init	stage	minor	v0.37.2 -> v0.39.0

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