[nix] Pin nix version to 2.17.1 (#1526)

## Summary

Due to this bug: NixOS/nix#9052 let's pin nix
version until resolved.

## How was it tested?

In fresh docker ubuntu:

```
devbox setup nix
devbox init
devbox add hello
devbox run hello
```

(cherry picked from commit 462487d)

internal/nix/install.go

@@ -37,7 +37,7 @@ func Install(writer io.Writer, daemon *bool) error {
 	}
 	defer r.Close()
 
-	installScript := "curl -L https://nixos.org/nix/install | sh -s"
+	installScript := "curl -L https://releases.nixos.org/nix/nix-2.17.1/install | sh -s"
 	if daemon != nil {
 		if *daemon {
 			installScript += " -- --daemon"