japanese/font-migmix: Update to 1.0.20231123 and take maintainership

In this release, the version numbers for 1? and 2? are different.
Update MASTER_SITES, DISTFILES and WWW.

Changelog (japanese):
https://itouhiro.github.io/mixfont-mplus-ipa/changelog.html

PR: 277645
Approved by: hrs (maintainer timeout > 3 months)
Approved by: fluffy (mentor), osa (mentor)