v1.17.1-mod.2025.4

What's Changed

• PDF暗号化機能を追加 by @fal-works in #3
• 四角形の描画時に角丸を適用できる機能を追加 by @fal-works in #5
• fontkit をフォーク版に切り替え & 関連処理を最新化 by @fal-works in #7

Full Changelog: https://github.com/DenkiYagi/pdf-lib/commits/v1.17.1-mod.2025.4