wrong OS value in win32

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• Task version: Task version: v3.37.2 (h1:Jwgvo+2vX79Fu+44xPxVKC5DIkUE89QeDjN2tmYaQzA=)
• Operating system: windows 10
• Experiments enabled: none

by doc ( https://taskfile.dev/usage/#gos-template-engine ), template value OS on win32 is windows, but it's actually Windows_NT.

  test:
    - echo "{{ .OS }}"

and it output Windows_NT

I'm guessing, it's overrided by env var OS, which is `Windows_NT?

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OK, I should use {{ OS }} instead of {{ .OS }}