Re-add nixos-unstable to version list

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: antonym

version.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 set -e
-VERSION=$(git ls-remote --tags https://github.com/nix-community/nixos-images.git | grep -v assets | grep -v nixos-unstable | awk -F'/' '{print $3}' | sort -r | paste -s -d 'Q' -)
+VERSION=$(git ls-remote --tags https://github.com/nix-community/nixos-images.git | grep -v assets | awk -F'/' '{print $3}' | sort -r | paste -s -d 'Q' -)
 
 # make sure the return has a sane version
 while [[ "${VERSION}" =~ ^nixos-.* ]]; do