Fix non-constant format string error on go 1.26

[dsimansk]

Changes

• Fix non-constant format string error on go 1.26

Bumping go directive in go.mod to force error fix verification through unit tests. The 1.26's go vet is has tighter recognition of string formatters not being present.

testing/duck/testbindable.go:153:63: non-constant format string in call to (knative.dev/pkg/apis.ConditionManager).MarkFalse

Appeared here: #3391

Release Note

Fix non-constant format string error on go 1.26

/cc @gauron99 @kahirokunn

[dsimansk]

There's couple more occasions of same use across our repos: #3387

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.88%. Comparing base (d2a153a) to head (3ad1cca).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3392      +/-   ##
==========================================
+ Coverage   74.85%   74.88%   +0.02%     
==========================================
  Files         189      189              
  Lines        8349     8349              
==========================================
+ Hits         6250     6252       +2     
+ Misses       1854     1853       -1     
+ Partials      245      244       -1     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[gauron99]

/lgtm

[dsimansk]

Until downstream Serving repo is resolved.

/hold

[kahirokunn]

/lgtm

[aliok]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [aliok,dsimansk]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[Copilot]

Copilot review overview

🟢 Approval recommended

The reviewed changes address the Go 1.26 diagnostic without unresolved issues.

Review effort: Lite
Findings: None

What changed in this PR

Fixes Go 1.26 format-string validation errors while preserving condition messages.

Changes:

• Uses a constant %s format for dynamic messages.
• Updates the Go module directive to 1.26.0.

File	Description
testing/​duck/​testbindable.go	Fixes the non-constant format string call.
go.mod	Sets the required Go version to 1.26.0.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[dsimansk]

/unhold