chore(PL-6701): update go language version to 1.26.5

[nwaller-nesto]

What

Bump the go directive in go.mod to 1.26.5 (and re-run go mod tidy).

Why

Fixes the Snyk std/os finding, which requires Go >= 1.25.12 / 1.26.5 / 1.27.0-rc.2.

References

• 🎫 https://nestoca.atlassian.net/browse/PL-6701

Summary by CodeRabbit

• Chores
  • Updated the application’s Go toolchain version to 1.26.5.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ac09e1d1-1f8d-47fc-a2c5-40acd2f3c664

📥 Commits

Reviewing files that changed from the base of the PR and between d395dc4 and 94cff74.

📒 Files selected for processing (1)

• go.mod

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📝 Walkthrough

Walkthrough

The Go toolchain directive in go.mod is updated from version 1.26.4 to 1.26.5; no dependencies or other module metadata change.

Changes

Go toolchain update

Layer / File(s)	Summary
Update Go directive go.mod	Bumps the declared Go version from 1.26.4 to 1.26.5.

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

Suggested reviewers: davidmdm

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/go-language-update

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