Upgrade to Commons Dbcp2 2.6.0

Closes gh-16143

Author: wilkinsona

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -47,7 +47,7 @@
 		<cassandra-driver.version>3.6.0</cassandra-driver.version>
 		<classmate.version>1.4.0</classmate.version>
 		<commons-codec.version>1.12</commons-codec.version>
-		<commons-dbcp2.version>2.5.0</commons-dbcp2.version>
+		<commons-dbcp2.version>2.6.0</commons-dbcp2.version>
 		<commons-lang3.version>3.8.1</commons-lang3.version>
 		<commons-pool.version>1.6</commons-pool.version>
 		<commons-pool2.version>2.6.1</commons-pool2.version>