www/rubygem-akami: update to 1.3.3 and take maintanership

While here:

• Updated PORTVERSION to DISTVERSION
• Added more description about the port
• Sort variables to make portclippy happy

Changelog: https://github.com/savonrb/akami/blob/v1.3.3/CHANGELOG.md

PR: 288448
Reported by: Atanu Biswas <atanubiswas484@gmail.com> (new maintainer)