Use release version for operator.tekton.dev/release label value

[alexashley]

Changes

I was looking at the latest (v0.49.0) release and noticed that the operator.tekton.dev/release label still had the devel value instead of the release tag:

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    operator.tekton.dev/release: devel
    version: v0.49.0
  name: tekton-operator-webhook
  namespace: tekton-operator

I wasn't able to test the pipeline after the changes, but I did run sed in the repo and saw the expected diff.

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Release Notes

The `operator.tekton.dev/release` label value is now populated with the release version

[tekton-robot]

Hi @alexashley. 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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[vdemeester]

/ok-to-test
/cc @tektoncd/operator-maintainers

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vdemeester

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[savitaashture]

/lgtm

[savitaashture]

/lgtm