chore(ci): DSPX- 2960 - bump Go toolchain to 1.25.9 to fix govulncheck reported vulnerabilities

[sievdokymov-virtru]

Summary

Bumps the Go toolchain from go1.25.8 to go1.25.9 to resolve 4 standard library vulnerabilities flagged by govulncheck:

CVE	Package	Description
GO-2026-4947	crypto/x509	Unexpected work during chain building
GO-2026-4946	crypto/x509	Inefficient policy validation
GO-2026-4870	crypto/tls	Unauthenticated TLS 1.3 KeyUpdate causes DoS
GO-2026-4865	html/template	XSS via JsBraceDepth context tracking

No code changes required — this is a patch release with no breaking changes.

Vulns were initially reported in opentdf/otdfctl and PR submitted as opentdf/otdfctl#796

Test plan

• target vulnerabilities are solved, govulncheck step passes in CI

Summary by CodeRabbit

• Chores
  • Updated Go toolchain to version 1.25.9 across all project modules and CI/CD infrastructure.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a routine maintenance update of the Go toolchain to the latest patch release. The primary objective is to resolve known security vulnerabilities within the Go standard library, ensuring the platform remains secure and compliant with current security standards. No functional code changes were required for this update.

Highlights

• Go Toolchain Update: Updated the Go toolchain version from 1.25.8 to 1.25.9 across all project modules and the workspace file.
• Security Remediation: Addressed four standard library vulnerabilities identified by govulncheck in crypto/x509, crypto/tls, and html/template.

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Ignored Files

• Ignored by pattern: .github/workflows/** (2)
  • .github/workflows/checks.yaml
  • .github/workflows/sonarcloud.yml
• Ignored by pattern: protocol/**/* (1)
  • protocol/go/go.mod

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The toolchain moves to a newer state, / To keep the code secure and great. / With vulnerabilities now gone, / The build process carries on.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Updates Go toolchain version from 1.25.8 to 1.25.9 across all module files and bumps GitHub Actions workflows to use Go 1.25.9.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflows .github/workflows/checks.yaml, .github/workflows/sonarcloud.yml	Updates Go version from 1.25.7 / 1.25.8 to 1.25.9 in govulncheck and test workflows.
Go Module Toolchain Updates examples/go.mod, lib/fixtures/go.mod, lib/flattening/go.mod, lib/identifier/go.mod, lib/ocrypto/go.mod, otdfctl/go.mod, protocol/go/go.mod, sdk/go.mod, service/go.mod, test/integration/go.mod, tests-bdd/go.mod	Updates toolchain directive from go1.25.8 to go1.25.9 in all module files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fix(deps): bump moby/buildkit to v0.28.1 for govulncheck #3225: Modifies Go module version metadata and toolchain directives in multiple go.mod files for version consistency.

Suggested labels

comp:ci, size/s

Suggested reviewers

• c-r33d
• elizabethhealy

Poem

🐰 A rabbit hops through version trees,
From 1.25.8 to .9 with ease,
Each module file gets the update right,
Go workflows shine in newest light!
Consistency hopped throughout the land! 🌟

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically identifies the main change: bumping Go toolchain to 1.25.9 to address govulncheck vulnerabilities.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dspx-2960-bump-go-toolchain-1.25.9

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[gemini-code-assist]

Code Review

This pull request updates the Go toolchain version from 1.25.8 to 1.25.9 across multiple modules and the workspace file. Feedback indicates that the protocol/go/go.mod file was omitted from these updates and should be included to ensure consistency across the entire project.

[github-actions]

Benchmark results, click to expand

Benchmark authorization.GetDecisions Results:

Metric	Value
Approved Decision Requests	1000
Denied Decision Requests	0
Total Time	144.127504ms

Benchmark authorization.v2.GetMultiResourceDecision Results:

Metric	Value
Approved Decision Requests	1000
Denied Decision Requests	0
Total Time	71.760434ms

Benchmark Statistics

Name	№ Requests	Avg Duration	Min Duration	Max Duration

Bulk Benchmark Results

Metric	Value
Total Decrypts	100
Successful Decrypts	100
Failed Decrypts	0
Total Time	345.858017ms
Throughput	289.14 requests/second

TDF3 Benchmark Results:

Metric	Value
Total Requests	5000
Successful Requests	5000
Failed Requests	0
Concurrent Requests	50
Total Time	33.585645019s
Average Latency	334.887788ms
Throughput	148.87 requests/second

[github-actions]

⚠️ Govulncheck found vulnerabilities ⚠️

The following modules have known vulnerabilities:

• tests-bdd

See the workflow run for details.

[github-actions]

X-Test Failure Report

✅ go-pull-3390
✅ java-pull-3390
✅ java-v0.9.0
✅ js-pull-3390
✅ js-v0.9.0
cukes-report
opentdfplatformS69ACC.dockerbuild
govulncheck-failure-8

[github-actions]

X-Test Results

✅ go-v0.9.0
✅ go-pull-3390
✅ java-pull-3390
✅ java-v0.9.0
✅ js-pull-3390
✅ js-v0.9.0
cukes-report
opentdfplatformS69ACC.dockerbuild
govulncheck-failure-8