Remove deprecated yaml from release script

[dsimansk]

PTAL @astelmashenko

If that makes sense now with removed natss bits.

[knative-prow]

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This pull-request has been approved by: dsimansk

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.53%. Comparing base (5818fdd) to head (ea940ca).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #615   +/-   ##
=======================================
  Coverage   35.53%   35.53%           
=======================================
  Files          45       45           
  Lines        2721     2721           
=======================================
  Hits          967      967           
  Misses       1689     1689           
  Partials       65       65           

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[astelmashenko]

/lgtm

[dsimansk]

/cherry-pick release-1.16

[knative-prow-robot]

@dsimansk: new pull request created: #616

In response to this:

/cherry-pick release-1.16

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