japanese/ibus-anthy: Update to 1.5.16

This update includes a fix to support Python 3.11+. As the default
Python version has been updated to 3.11 on 20240529, this update is
needed.

PR: 282462
Reported by: Paula Breton <freebsd@breton.xyz>
Approved by: WATANABE Kazuhiro <CQG00620@nifty.ne.jp> (maintainer)
Changes: https://github.com/ibus/ibus-anthy/releases/tag/1.5.16
Changes: https://github.com/ibus/ibus-anthy/releases/tag/1.5.15
Changes: https://github.com/ibus/ibus-anthy/releases/tag/1.5.14
Changes: https://github.com/ibus/ibus-anthy/releases/tag/1.5.13
Changes: https://github.com/ibus/ibus-anthy/releases/tag/1.5.12

(cherry picked from commit 1ab7cc7fb4354a708ce71af86036c75513c225e9)