chore(go): bump Go version to 1.25.6 across modules

[JmPotato]

What problem does this PR solve?

Issue Number: Close #10210.

What is changed and how does it work?

Update `go.mod` files for the main project, client, tools, and integration tests to target Go `1.25.6` for consistent builds and tooling.

Check List

Tests

• Unit test
• Integration test

Release note

None.

Summary by CodeRabbit

• Chores
  • Upgraded Go toolchain to version 1.25.6 across build environments.

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request updates the Go toolchain version from 1.25.5 to 1.25.6 across all go.mod files in the project: the root module, client, tests/integrations, and tools directories. No dependencies, replace directives, or functionality are affected.

Changes

Cohort / File(s)	Summary
Go Toolchain Version Bump go.mod, client/go.mod, tests/integrations/go.mod, tools/go.mod	Updated Go toolchain version directive from 1.25.5 to 1.25.6 across all module files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Hoppy news! Go 1.25.6 hops in,
Four modules bump their toolchain skin,
Patch by patch, we stay current and spry,
No breaking changes, just patches on high! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: updating Go version to 1.25.6 across multiple modules. It is specific, directly related to the changeset, and follows good naming conventions.
Description check	✅ Passed	The PR description includes the required Issue Number linking to #10210, a detailed commit message explaining the changes, and appropriate test checkboxes. All critical sections are completed.
Linked Issues check	✅ Passed	The PR successfully addresses the objective from Issue #10210 by updating Go toolchain versions from 1.25.5 to 1.25.6 across all four go.mod files (main, client, tools, and tests).
Out of Scope Changes check	✅ Passed	All changes are narrowly scoped to updating Go version directives in go.mod files. No unrelated changes, dependency modifications, or other out-of-scope alterations are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.70%. Comparing base (92e0ed9) to head (fade74f).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10211   +/-   ##
=======================================
  Coverage   78.69%   78.70%           
=======================================
  Files         520      520           
  Lines       70089    70089           
=======================================
+ Hits        55158    55161    +3     
- Misses      10957    10960    +3     
+ Partials     3974     3968    -6     

Flag	Coverage Δ
unittests	78.70% <ø> (+<0.01%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bufferflies, disksing

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 [bufferflies,disksing]

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

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-02-04 06:08:17.212950176 +0000 UTC m=+247168.314348898: ☑️ agreed by disksing.
• 2026-02-04 06:30:23.708905166 +0000 UTC m=+248494.810304192: ☑️ agreed by bufferflies.

[wuhuizuo]

/retest

[JmPotato]

/retest

[JmPotato]

/retest

[JmPotato]

/retest

[JmPotato]

/retest

[JmPotato]

/test pull-unit-test-next-gen-3

[JmPotato]

/retest

[JmPotato]

/cherry-pick release-nextgen-20251011

[ti-chi-bot]

@JmPotato: new pull request created to branch release-nextgen-20251011: #10222.
But this PR has conflicts, please resolve them!

Details

In response to this:

/cherry-pick release-nextgen-20251011

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