I think that should be enough. Maybe try two vCPUs if you wanna host other stuff too. But for just some mirrors/aggregators, one vCPU is probably enough. I don't think you really need to worry about RAM or storage either.

Computers are plenty fast these days. I think you'll only start to see actual performance issues when handling hundreds of simultaneous users.

In any case, you shouldn't be spending over $10/month. You can get much lower. Take a look at this. I don't know how reliable or secure they are, but they're very cheap. I've used their VPS in the past, and it seemed pretty okay.

Edit: You can also do what I do for heavier stuff like Jellyfin or Immich, and simply use the VPS as a relay. The actual stuff runs on my home server, connects to the VPS via Wireguard, which then masks its IP.