net-p2p/readarr: Update to 0.3.21.2475

ChangeLog: https://github.com/Readarr/Readarr/releases/tag/v0.3.21.2475

• Fixed: Task progress messages in the UI
• Fix BookInfo tests
• Multiple Translations updated by Weblate
• Fixed icons for macOS application
• Link to author from book details
• New: Show author names after task name when applicable
• Fixed: Disabled select option still selectable
• Ensure authors are populated in PageConnector
• Ensure not allowed cursor is shown for disabled select inputs
• Fixed: Wrapping of naming tokens with alternate separators

PR: 278026
Reported by: michiel@vanbaak.eu (maintainer)