Documentation error for arm64 install

[chigozienri]

Both the readme and https://replicate.com/docs/guides/push-a-model#install-cog say to install as follows:

sudo curl -o /usr/local/bin/cog -L https://github.com/replicate/cog/releases/latest/download/cog_`uname -s`_`uname -m`
sudo chmod +x /usr/local/bin/cog

However, the releases for arm64 are named in this format: default.cog_darwin_arm64 so the download url is incorrect.