🌱chore: upgrade to go 1.26

[tesshuflower]

Upgrades Go version from 1.25 to 1.26.

Changes:

• go.mod — go directive updated to 1.26.0
• .github/workflows/go.yml — GO_VERSION updated to 1.26

Relates to: open-cluster-management-io/ocm#1555

Summary by CodeRabbit

• Chores
  • Updated Go toolchain version from 1.25 to 1.26 for all build and test processes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 07b48ac3-49e8-42c8-9d44-afca876882ff

📥 Commits

Reviewing files that changed from the base of the PR and between 3ea63fb and 7f7299c.

📒 Files selected for processing (2)

• .github/workflows/go.yml
• go.mod

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Walkthrough

The pull request upgrades the Go toolchain version from 1.25 to 1.26 across two configuration artifacts: the GitHub Actions workflow environment variable GO_VERSION and the go.mod module directive, ensuring all CI jobs and module builds consistently use Go 1.26.

Changes

Go Toolchain Version Upgrade

Layer / File(s)	Summary
Go 1.26 version bump in workflow and module .github/workflows/go.yml, go.mod	Workflow GO_VERSION environment variable and go.mod go directive both updated from 1.25 to 1.26, coordinating CI and module toolchain versions across all jobs.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• open-cluster-management-io/sdk-go#126: Both PRs update the Go toolchain version in CI/workflow and the go.mod go directive.
• open-cluster-management-io/sdk-go#225: Adjusts lint scripts' Go-version detection to pick a compatible golangci-lint for Go 1.26+, triggered by this Go 1.26 upgrade.
• open-cluster-management-io/sdk-go#131: Prior Go version bump (1.23→1.24) using the same pattern of updating workflow and go.mod directives.

Suggested labels

approved, lgtm

Suggested reviewers

• qiujian16
• deads2k
• mikeshng

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: upgrading Go from version 1.25 to 1.26, with appropriate emoji classification for chore/misc work.
Description check	✅ Passed	The description provides a clear summary and lists specific files changed with their modifications, though it lacks the structured template sections (Summary, Related issue(s)) from the repository template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[mikeshng]

@coderabbitai review

[coderabbitai]

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[qiujian16]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiujian16, tesshuflower

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• OWNERS [qiujian16]

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