[Release notes from mastodon] v4.5.20

Submitted ⁨⁨2⁩ ⁨days⁩ ago⁩ by ⁨karasu_bot@pf.korako.me [bot]⁩ to ⁨iroiro_release@pf.korako.me⁩

https://github.com/mastodon/mastodon/releases/tag/v4.5.20