chore: remove unused commons-pool.version property.

commons-pool was required by commons-dbcp but as the latter was replaced by HikariCP, we don't need
former as well.

Should be in 962cf02 commit.

Follow-up to #19

Author: php-coder

pom.xml

@@ -460,9 +460,6 @@
 		<codenarc.plugin.version>0.22-1</codenarc.plugin.version>
 		<codenarc.version>0.27.0</codenarc.version>
 
-		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.22.RELEASE/spring-boot-dependencies/pom.xml) -->
-		<commons-pool.version>1.5.4</commons-pool.version>
-		
 		<commons.lang.version>3.8</commons.lang.version>
 		<commons.text.version>1.4</commons.text.version>
 		<compiler.plugin.version>3.7.0</compiler.plugin.version>