[release-1.15] Update OWNERS file

[serverless-qe]

Update OWNERS file

[openshift-ci]

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[rudyredhat1]

/retest kn-plugin-event-test-eventshub-115-on-pull-request

[openshift-ci]

@rudyredhat1: The /retest command does not accept any targets.
The following commands are available to trigger required jobs:

/test 419-e2e

/test 419-images

/test 419-unit

In response to this:

/retest kn-plugin-event-test-eventshub-115-on-pull-request

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[openshift-ci]

There are empty aliases in OWNER_ALIASES, cleanup is advised.