chore: bump install script version to 2.2.1

Update VERSION and CLI_VERSION in install.sh to match current release.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dhanesh

install/install.sh

@@ -18,8 +18,8 @@ NC='\033[0m' # No Color
 BOLD='\033[1m'
 
 # Manifold info
-VERSION="2.0.0"
-CLI_VERSION="2.0.0"
+VERSION="2.2.1"
+CLI_VERSION="2.2.1"
 REPO="https://raw.githubusercontent.com/dhanesh/manifold/main"
 RELEASES="https://github.com/dhanesh/manifold/releases/download"