bump installed nix version to latest, and update test-nix-versions (#2301)

## Summary

Bumping to 2.24.7 which seems latest tag on
https://github.com/NixOS/nix/tags

Our current hardcoded one is fairly old (we should more periodically
update this),
and is leading to issues with MacOS Sequoia (see
NixOS/nix#11543)

Also add this to the test-nix-versions. I am keeping the older nix
versions
around because some of them exercise older nix profile (and other
similar issues
that i am failing to recall atm) formats that some users may still be
reliant on.

At some point, we should consider bumping up our minimum nix version as
well
so we can deprecate legacy nix support (and keep the code base neater).

## How was it tested?

@Lagoja is testing this manually

will ensure cicd pass as a sanity test

Author: savil

.github/workflows/cli-tests.yaml

@@ -208,13 +208,13 @@ jobs:
         run: devbox rm go
 
   # Run a sanity test to make sure Devbox can install and remove packages with
-  # the last 3 Nix releases.
+  # the last few Nix releases.
   test-nix-versions:
     needs: build-devbox
     strategy:
       matrix:
         os: [ubuntu-latest, macos-13]
-        nix-version: [2.15.1, 2.16.1, 2.17.0, 2.18.0, 2.19.2]
+        nix-version: [2.15.1, 2.16.1, 2.17.0, 2.18.0, 2.19.2, 2.24.7]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4

internal/nix/install.go

@@ -38,7 +38,7 @@ func Install(writer io.Writer, daemon *bool) error {
 	}
 	defer r.Close()
 
-	installScript := "curl -L https://releases.nixos.org/nix/nix-2.18.1/install | sh -s"
+	installScript := "curl -L https://releases.nixos.org/nix/nix-2.24.7/install | sh -s"
 	if daemon != nil {
 		if *daemon {
 			installScript += " -- --daemon"