Upgrade to commons-dbcp2 2.6.0

Author: kazuki43zoo

pom.xml

@@ -227,7 +227,7 @@
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-dbcp2</artifactId>
-      <version>2.5.0</version>
+      <version>2.6.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>