fluidsynth 2.3.1

• Prevent MIDI player from finishing prematurely (#1159, thanks to @topaz)
• Fix a crash when enumerating rawmidi ALSA devices (#1174, thanks to @Bob131)
• Restore systemd sandboxing options and make it work with user units (#1181, thanks to @bluca)
• Handle conflict with pipewire systemd daemon (#1177)