Update gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init Docker tag to v0.24.2

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init		patch	v0.24.1 -> v0.24.2
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init	stage	patch	v0.24.1 -> v0.24.2

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