shairport-sync: bump to version 3.1.1

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/shairport-sync/shairport-sync.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256  b348b9b3cf3994d9222430bc514c94a22f2ed173956fdb097f3354cdba8fd198  shairport-sync-3.0.2.tar.gz
+sha256  731e23f12ca1d645989843a15259ea0bf4d18adea94cf55f6fcc63d7b55fb53b  shairport-sync-3.1.1.tar.gz

package/shairport-sync/shairport-sync.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SHAIRPORT_SYNC_VERSION = 3.0.2
+SHAIRPORT_SYNC_VERSION = 3.1.1
 SHAIRPORT_SYNC_SITE = $(call github,mikebrady,shairport-sync,$(SHAIRPORT_SYNC_VERSION))
 
 SHAIRPORT_SYNC_LICENSE = MIT, BSD-3-Clause