Fix Subscription's Channel to use KRefence type

[dsimansk]

Description

Per update on Eventing side, use the correct type in client code.

Changes

• Fix Subscription's Channel to use KRefence type

Reference

knative/eventing#5412

/cc @knative/client-reviewers

[codecov]

Codecov Report

Merging #1326 (39aba27) into main (d0327bc) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1326   +/-   ##
=======================================
  Coverage   72.97%   72.97%           
=======================================
  Files         160      160           
  Lines        8151     8151           
=======================================
  Hits         5948     5948           
  Misses       1476     1476           
  Partials      727      727           

Impacted Files	Coverage Δ
pkg/kn/flags/channel_types.go	93.33% <100.00%> (ø)

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[navidshaikh]

/assign

[navidshaikh]

/lgtm
/approve

[knative-prow-robot]

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