ci: add expire_in to sign_windows job artifacts

Kai Armstrongrequested to merge
karmstrong/fix-artifact-expiration into main

Summary

  • sign_windows_glab and sign_windows_installer were missing expire_in on their artifact definitions
  • Signed Windows binaries were accumulating in artifact storage indefinitely
  • Set expire_in: 7 days to match all other artifact-producing jobs in the pipeline

Test plan

  • Verify CI pipeline passes
  • Confirm signed Windows artifact jobs show artifacts_expire_at set after next pipeline run

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