何が起きたのか：
892さんと同じくjava version "1.8.0_411"にアップデートした後から変換時に文字化けエラーが発生
java version "1.8.0_411をアンインストール、Version：21をインストール
AozoraEpub3-1.1.0b55QからAozoraEpub3-1.1.1b23Qに設定切り替え
再現方法（何をやったら起こったのか詳細に）：
EPUBに変換を実行
AozoraEpub3でEPUBに変換しています....C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/novelconverter.rb:202:in `txt_to_epub': invalid byte sequence in UTF-8 (ArgumentError)
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/novelconverter.rb:315:in `convert_txt_to_ebook_file'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:300:in `convert_txt_to_ebook_file'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/commandbase.rb:152:in `call'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/commandbase.rb:152:in `hook_call'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:252:in `block in convert_novel_main'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:248:in `each'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:248:in `convert_novel_main'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:201:in `block (2 levels) in convert_novels'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/mixin/locker.rb:26:in `lock'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:200:in `block in convert_novels'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:199:in `each'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:199:in `with_index'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:199:in `convert_novels'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:159:in `block in main'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:152:in `each'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:152:in `main'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:133:in `execute'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/commandbase.rb:125:in `execute!'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/commandbase.rb:134:in `execute!'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:123:in `block in execute!'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/narou.rb:369:in `concurrency_call'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/command/convert.rb:122:in `execute!'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/commandline.rb:29:in `run'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/commandline.rb:43:in `run!'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/narou.rb:50:in `block in <top (required)>'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/lib/backtracer.rb:16:in `capture'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/narou.rb:49:in `<top (required)>'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/bin/narou:13:in `require_relative'
from C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/narou-3.8.2/bin/narou:13:in `<top (required)>'
from C:/Ruby32-x64/bin/narou:32:in `load'
from C:/Ruby32-x64/bin/narou:32:in `<main>'
