[release-1.21] bump to trigger point release

[dprotaso]

Bump serving to trigger release to rebuild with 1.25.7

Part of #16402

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.19%. Comparing base (4004491) to head (09291c2).
⚠️ Report is 1 commits behind head on release-1.21.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.21   #16408      +/-   ##
================================================
+ Coverage         80.17%   80.19%   +0.02%     
================================================
  Files               216      216              
  Lines             13440    13440              
================================================
+ Hits              10775    10778       +3     
+ Misses             2300     2299       -1     
+ Partials            365      363       -2     

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[dprotaso]

/assign @linkvt

[dprotaso]

/retest

[dprotaso]

/retest

[linkvt]

/lgtm