mpd: update to 0.21.6.

srcpkgs/mpd/template

@@ -1,7 +1,7 @@
 # Template file for 'mpd'
 pkgname=mpd
-version=0.21.5
-revision=2
+version=0.21.6
+revision=1
 build_style=meson
 configure_args="-Dopus=enabled -Dmikmod=enabled -Dneighbor=true
  -Dsoundcloud=enabled -Dpipe=true -Dtwolame=enabled -Dbzip2=enabled
@@ -33,7 +33,7 @@ license="GPL-2.0-or-later"
 homepage="https://www.musicpd.org/"
 changelog="https://raw.githubusercontent.com/MusicPlayerDaemon/MPD/v${version}/NEWS"
 distfiles="https://www.musicpd.org/download/mpd/${version%.*}/mpd-${version}.tar.xz"
-checksum=2ea9f0eb3a7bdae5d705adf4e8ec45ef38b5b9ddf133f32b8926dd4e205b0ef9
+checksum=8d4d116acc069872ba68741016d284885e93f8558a88d0c7ed246b8e1f40e59f
 LDFLAGS+=" -Wl,-z,stack-size=1048576"
 
 system_accounts="mpd"