[windows-integration] Update stale SHA-pinned actions in windows-cli-integration.yml to match repository conventions

[github-actions]

The workflow at .github/workflows/windows-cli-integration.yml uses outdated SHA pins for two GitHub Actions that are out of sync with the rest of the hand-written (non-compiled) workflows in this repository.

Required changes

Action	Current pin	Current version	Repo-standard pin	Repo-standard version
actions/checkout	de0fac2e4500dabe0009e67214ff5f5447ce83dd	v6.0.2	df4cb1c069e1874edd31b4311f1884172cec0e10	v6.0.3
actions/setup-go	4dc6199c7b1a012772edbd06daecab0f50c9053c	v6	4a3601121dd01d1626a1e23e37211e3254c1c06c	v6.4.0

Both the build and integration jobs use actions/checkout, so there are two instances to update.

Acceptance criteria

• actions/checkout in both build and integration jobs updated to df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
• actions/setup-go in the build job updated to 4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
• All other workflow behavior (triggers, jobs, scenario matrix, chaos tests, hang detection, conclusion job) remains unchanged

Evidence

Other non-lock workflows such as agentics-maintenance.yml consistently use the repo-standard pins listed above. The upload-artifact and download-artifact pins (v4) are already aligned with the repo convention and do not need to change.

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