fix: get actual protocol for windows instead of protocol + drive

[sheremet-va]

On windows current regexp from this url gets incorrect protocol:

file:///C:/path

• Incorrect: file:///C
• Correct: file

This PR fixes it making {2,} ungreedy, so it will end after the first :. (You can test it in https://regex101.com/)

Related: vitest-dev/vitest#379

[antfu]

Can you add some tests?

[sheremet-va]

Can you add some tests?

Your test setup doesn't allow me to import that function to properly test it, unless I can export it.

isValidNodeImport checks on the running machine, but tests run only on ubuntu and even then it's hard to replicate without Windows.

[pi0]

LGTM. Thanks!