Release notes for MuseScore 4.x

No real release notes, just announcements

• 4.1.1, July 26, 2023 (see changelog)
• 4.1.0, July 12, 2023 (see changelog)
• 4.0.2, March 13, 2023 (see changelog)
• 4.0.1, January 13, 2023 (see changelog)
• 4.0.0, December 14, 2022