devel/maven39: Update to 3.9.6

[michaelo]

Summary

Approved by: jrm (mentor), otis (mentor)
Release Notes: https://maven.apache.org/docs/3.9.6/release-notes.html

[jrm]

Looks good to me.

• http://pkg.ftfl.ca/data/13i386-default/2023-12-12_11h28m52s/logs/maven39-3.9.6.log
• http://pkg.ftfl.ca/data/13amd64-default/2023-12-12_11h28m52s/logs/maven39-3.9.6.log
• http://pkg.ftfl.ca/data/14amd64-default/2023-12-12_11h28m52s/logs/maven39-3.9.6.log
• http://pkg.ftfl.ca/data/15amd64-default/2023-12-12_11h28m52s/logs/maven39-3.9.6.log