update 2.4 references to 3

salt/manager/tools/sbin/so-saltstack-update

@@ -143,7 +143,7 @@ show_usage() {
     echo "  -v       Show verbose output (files changed/added/deleted)"
     echo "  -vv      Show very verbose output (includes file diffs)"
     echo "  --test   Test mode - show what would change without making changes"
-    echo "  branch   Git branch to checkout (default: 2.4/main)"
+    echo "  branch   Git branch to checkout (default: 3/main)"
     echo ""
     echo "Examples:"
     echo "  $0                    # Normal operation"
@@ -193,7 +193,7 @@ done
 
 # Set default branch if not provided
 if [ -z "$BRANCH" ]; then
-  BRANCH=2.4/main
+  BRANCH=3/main
 fi
 
 got_root