Revert update to H2 driver, since it requires Java 8

Author: sualeh

schemacrawler-jdbc-drivers/pom.xml

@@ -56,7 +56,7 @@
     <dependency>
       <groupId>com.h2database</groupId>
       <artifactId>h2</artifactId>
-      <version>2.3.230</version>
+      <version>2.2.224</version>
     </dependency>
     <dependency>
       <groupId>org.hsqldb</groupId>