Ensure array return type

This caused issues with the rename_column, as column_info expects an array
Yoast · diedexx · Nov 12, 2021 · Nov 12, 2021 · Nov 15, 2021 · Nov 15, 2021
commit b3fd2cd266504945441c4233e7e821a35d007963
diff --git a/lib/migrations/adapter.php b/lib/migrations/adapter.php
@@ -331,7 +331,7 @@ public function select_one( $query ) {
 				return false;
 			}
 
-			return $wpdb->last_result[0];
+			return (array) $wpdb->last_result[0];
 		}
 
 		return false;