fix: bump Go to 1.25.12 to resolve GO-2026-5856

[dacrab]

Summary

The scheduled Security workflow (govulncheck) failed on main (run #29181607793) due to:

• GO-2026-5856 — Encrypted Client Hello privacy leak in crypto/tls
  • Found in: crypto/tls@go1.25.11
  • Fixed in: crypto/tls@go1.25.12

This was introduced by the patch-level Go toolchain pinned via go.mod (go 1.25.11). Bumping to go 1.25.12 resolves the advisory.

Verification

• go mod tidy succeeds.
• govulncheck ./... reports: No vulnerabilities found.

Note

The Security workflow only runs on push to main / schedule, so it won't re-run on this PR. After merge, trigger it manually (workflow_dispatch) or wait for the weekly schedule to confirm the alert clears.

Summary by CodeRabbit

• Chores
  • Updated the Go toolchain version to 1.25.12.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c17a0d0b-cd86-46fd-bf28-6500a4933c5b

📥 Commits

Reviewing files that changed from the base of the PR and between f4e3e7a and b78d17a.

📒 Files selected for processing (1)

• go.mod

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📝 Walkthrough

Walkthrough

The module’s Go toolchain directive in go.mod was updated from version 1.25.11 to 1.25.12. No dependencies or other module metadata changed.

Changes

Go toolchain update

Layer / File(s)	Summary
Update Go version directive go.mod	The module’s go directive changes from 1.25.11 to 1.25.12.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change: bumping the Go toolchain to 1.25.12 to address GO-2026-5856.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/go-1.25.12-GO-2026-5856

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