dependencies: Fix #2297: Upgrade H2 (#2317)

* refactor: drop tables according to their dependencies

* refactor: renamed table because USER is an SQL keyword

* dep: upgrade com.h2database.h2 1.4.190 to 2.1.214

domain-model/src/main/java/com/iluwatar/domainmodel/App.java

@@ -60,8 +60,8 @@ public class App {
           + "customer_name varchar references CUSTOMERS(name));";
 
   public static final String DELETE_SCHEMA_SQL =
-      "DROP TABLE CUSTOMERS IF EXISTS;"
-          + "DROP TABLE PURCHASES IF EXISTS;"
+      "DROP TABLE PURCHASES IF EXISTS;"
+          + "DROP TABLE CUSTOMERS IF EXISTS;"
           + "DROP TABLE PRODUCTS IF EXISTS;";
 
   /**