[release-v1.21] Fix release branch mapping #1680

Namespace: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/ocp-serverless-tenant" rel="nofollow">ocp-serverless-tenant
PipelineRun: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/ocp-serverless-tenant/pipelinerun/kn-serving-webhook-121-on-pull-request-ws895" rel="nofollow">kn-serving-webhook-121-on-pull-request-ws895

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Konflux kflux-prd-rh02/kn-serving-webhook-121-on-pull-request has successfully validated your commit.

Status	Duration	Name
🟢 Succeeded	5 seconds	init
🟢 Succeeded	17 seconds	clone-repository
🟢 Succeeded	19 seconds	prefetch-dependencies
🟢 Succeeded	4 minutes	build-images
🟢 Succeeded	17 seconds	build-image-index
🟢 Succeeded	5 seconds	apply-tags
🟢 Succeeded	31 seconds	build-source-image
🟢 Succeeded	26 seconds	clair-scan
🟢 Succeeded	29 seconds	clamav-scan
🟢 Succeeded	10 seconds	deprecated-base-image-check
🟢 Succeeded	25 seconds	ecosystem-cert-preflight-checks
🟢 Succeeded	7 seconds	push-dockerfile
🟢 Succeeded	19 seconds	rpms-signature-scan
🟢 Succeeded	12 seconds	sast-shell-check
🟢 Succeeded	17 seconds	sast-snyk-check
🟢 Succeeded	48 seconds	sast-unicode-check