databases/apache-commons-dbutils: Update 1.7 => 1.8.1, take maintainership

Release Notes:
https://commons.apache.org/proper/commons-dbutils/changes-report.html

Improve port:

• replace PORTVERSION with DISTVERSION
• switched jar installation to use ${DISTVERSION} for flexibility
• replaced deprecated %%JAVAJARDIR%% with ${JAVAJARDIR} in PLIST_FILES
• pet portclippy
• take maintainership

PR: 286484