Incorrect assumption about `pnpm.cmd` extension on windows systems.

[mynk-tmr]

• I have searched for similar issues

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Steps to Reproduce

• Use mise polyglot tool to install pnpm mise use -g pnpm
• run ncu on repo
• it fails in installation setup pnpm.cmd is not a cmdlet .......

Logical Bug

If you use mise or scoop, pnpm is installed as binary and available as pnpm without extension. The fix is to try with pnpm first, if it fails try pnpm.cmd, then show error.

[raineorshine]

Thanks! Could you open a PR?

We should try pnpm.cmd first and then pnpm since that latter is less common on Windows.