Apple has updated its suite of operating systems once again, having only recently released major revisions for iOS 15, iPadOS 15, macOS 12 and watchOS 8. Supposedly, the interim updates improve iPhones and iPads in some areas, while making adjustments to other devices too.
https://www.notebookcheck.net/Apple-releases-interim-updates-for-HomePod-15-iOS-15-iPadOS-15-macOS-12-and-watchOS-8.611735.0.html