chore: Update Go toolchain version to 1.26.6 for vuln

[SoulPancake]

Description

What problem is being solved?

How is it being solved?

What changes are made to solve it?

References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

Summary by CodeRabbit

• Chores
  • Updated the required Go toolchain version to 1.26.6.

[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 Plus

Run ID: 68a6a07b-1bd1-49a3-89c9-69370b938d0e

📥 Commits

Reviewing files that changed from the base of the PR and between cef729e and 0066a3b.

📒 Files selected for processing (1)

• go.mod

Included review availability: Your plan includes up to 2 reviews per rolling hour; 1 remains after this review.

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Walkthrough

The pull request updates the Go toolchain requirement in go.mod from version 1.26.5 to 1.26.6.

Changes

Go toolchain update

Layer / File(s)	Summary
Update Go toolchain requirement go.mod	The required Go toolchain version changes from 1.26.5 to 1.26.6.

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

Merge Risk: ⚪ Minimal · up to 0066a

This is a narrowly scoped Go toolchain version update with no actionable merge-blocking risk remaining beyond normal checks and review.

Possibly related PRs

• openfga/cli#701: Both pull requests update the Go toolchain directive in go.mod.

Suggested reviewers: rhamzeh

🚥 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 and concisely describes the Go toolchain update and its vulnerability-related purpose.
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 chore/update-gotoolchain-vuln

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[Copilot]

Pull request overview

Updates the repository’s Go toolchain selection to address a vulnerability by bumping the toolchain directive in go.mod. This is a targeted maintenance change that affects which Go compiler version is used when building the project.

Changes:

• Bumped toolchain from go1.26.5 to go1.26.6 in go.mod.

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