Mark Corepack download warning as console.warn()

[swarnava]

Not sure why this is printing as error in logline. We probably should use console.warn() here:

corepack/sources/httpUtils.ts

Line 70 in c7a9bde

console.error(`! Corepack is about to download ${input}`);

[styfle]

It’s probably fine to change it but it won’t make a difference since the console.warn() function is an alias for console.error()

https://nodejs.org/api/console.html#consolewarndata-args