fix(benchmark): select npm.cmd on windows

[yaacovCR]

see: nodejs/node#3675
and in particular: nodejs/node#3675 (comment)

[netlify]

✅ Deploy Preview for compassionate-pike-271cb3 ready!

Name	Link
🔨 Latest commit	9a2ebdf
🔍 Latest deploy log	https://app.netlify.com/sites/compassionate-pike-271cb3/deploys/65f6cb8e7a0e890008c063d5
😎 Deploy Preview	https://deploy-preview-4030--compassionate-pike-271cb3.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[github-actions]

Hi @yaacovCR, I'm @github-actions bot happy to help you with this PR 👋

Supported commands

Please post this commands in separate comments and only one per comment:

• @github-actions run-benchmark - Run benchmark comparing base and merge commits for this PR
• @github-actions publish-pr-on-npm - Build package from this PR and publish it on NPM