[0.26] Embed Kn Plugin Event at ffdcc78

[cardil]

Changes:

• [release-0.26] 🐛 Use proper image instead of old quay.io/cardil/kn-event-sender knative-extensions/kn-plugin-event#133 - backported via 🤖 Synchronize branch release-0.26 to upstream/release-0.26 openshift-knative/kn-plugin-event#22

[cardil]

/cc @rhuss
/cc @mgencur

[cardil]

/retest

[openshift-ci]

@cardil: all tests passed!

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[rhuss]

@dsimansk this PR looks good to me, but would like to have a second opinion

[dsimansk]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cardil, dsimansk

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