muster release v5.48.0

Added

• (oauth) Provider Apps apart from MCPServers, several grants each in #1604 by @teemow

Fixed

• (oauth) A tenant server’s sign-ins go with its namespace; say why its sign-in is not ready in #1603 by @fiunchinho

Full Changelog: https://github.com/giantswarm/muster/compare/v5.47.0...v5.48.0