Update tekton tasks manifests to version v0.15.1

[ksimon1]

Update tekton tasks manifests to version v0.15.1
Release note:

NONE

[openshift-ci]

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[openshift-ci]

@ksimon1: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-tests	e72b1ed	link	true	/test e2e-tests

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[jcanocan]

Shouldn't this be backported in branch v0.15 instead of main?