Fix non-contant format string err in go 1.26

[dsimansk]

Fixes #

Proposed Changes

• Fix non-contant format string err in go 1.26

Release Note

Fix non-contant format string err in go 1.26

/cc @gauron99

Related to knative/pkg#3392

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dsimansk

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[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 20.09%. Comparing base (04c673f) to head (f5c3212).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/reconciler/source/githubsource.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #728   +/-   ##
=======================================
  Coverage   20.09%   20.09%           
=======================================
  Files          34       34           
  Lines        1204     1204           
=======================================
  Hits          242      242           
  Misses        958      958           
  Partials        4        4           

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[gauron99]

/lgtm