chore: 添加mysql依赖

iot-data/iot-rdb-data-service/pom.xml

@@ -28,10 +28,10 @@
             <artifactId>h2</artifactId>
         </dependency>
 
-<!--        <dependency>-->
-<!--            <groupId>mysql</groupId>-->
-<!--            <artifactId>mysql-connector-java</artifactId>-->
-<!--        </dependency>-->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+        </dependency>
 
         <dependency>
             <groupId>commons-io</groupId>