Log Message:
musicpd: update to 0.23.7.

ver 0.23.7 (2022/05/09)
* database
  - upnp: support pupnp 1.14
* decoder
  - ffmpeg: fix HLS seeking
  - opus: fix missing song length on high-latency files
* output
  - shout: require at least libshout 2.4.0
* mixer
  - pipewire: fix volume restore
  - software: update volume of disabled outputs
* support libiconv