I think Go ends up with fewer dependencies mostly because there is more friction in finding them. With rust (and npm) you just "cargo search xxx", then "cargo add xxx". Go makes you web search and poke around github looking for something. It's not onerous or anything, but just that extra step slows things down just a bit. C projects tend to have the least because it's even more annoying to add them and you have to create build commands that deal with slightly different distributions (and learn makefile+pkg-config or cmake, or autoconf).
Certainly having a larger stdlib helps Go projects keep their deps down, but I don't think it's the real reason.
Certainly having a larger stdlib helps Go projects keep their deps down, but I don't think it's the real reason.