fix: update go download url for linux (#275)

Our Linux builds use a custom script that fetches a Go binary from a
Google storage bucket. The URL pattern in release announcement uses
go.dev/dl instead, and the availability of binaries through storage
bucket links seems inconsistent recently:

_https://groups.google.com/g/golang-nuts/c/xL-B4XggX04?pli=1

So let's do what Google says we should anyway.

Author: ajkerrigan

ci-setup-golang.sh

@@ -12,7 +12,7 @@ case $OS in
     Linux) OS="linux" ;;
 esac    
 
-curl "https://storage.googleapis.com/golang/go${GOVER}.${OS}-${ARCH}.tar.gz" --silent --location | tar -xz
+curl "https://go.dev/dl/go${GOVER}.${OS}-${ARCH}.tar.gz" --silent --location | tar -xz
 
 export PATH="$(pwd)/go/bin:$PATH"