Update dead OSDN download URL

[nori-ut3g]

Problem

The download URL is broken - OSDN has been inaccessible since late 2023.

pdfshot/Dockerfile

Line 24 in a303348

curl -O https://jaist.dl.osdn.jp/users/8/8634/genshingothic-20150607.7z && \

Solution

Found working mirror URL: https://ftp.iij.ad.jp/pub/osdn.jp/users/8/8634/genshingothic-20150607.7z
Source: http://jikasei.me/font/genshin/
Please update the download URL to use this IIJ mirror instead.