[Auto] Update prow jobs for release branches

[knative-prow-updater-robot]

PR created for syncing Prow jobs for release branches changes

Produced by: release-jobs-syncer

[knative-prow]

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This pull-request has been approved by: knative-prow-updater-robot, upodroid

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[knative-prow]

@knative-prow-updater-robot: Updated the job-config configmap in namespace default at cluster default using the following files:

• key kn-plugin-quickstart-release-1.6.gen.yaml using file ``
• key kn-plugin-quickstart-release-1.9.gen.yaml using file prow/jobs/generated/knative-sandbox/kn-plugin-quickstart-release-1.9.gen.yaml
• key kn-plugin-source-kafka-release-1.6.gen.yaml using file ``
• key kn-plugin-source-kafka-release-1.9.gen.yaml using file prow/jobs/generated/knative-sandbox/kn-plugin-source-kafka-release-1.9.gen.yaml

In response to this:

PR created for syncing Prow jobs for release branches changes

Produced by: release-jobs-syncer

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