package/jack2: bump to version 1.9.21

https://github.com/jackaudio/jack2/releases/tag/v1.9.21

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit c0a13b667b8587816734c432c2e691d4c3ed9763)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/jack2/jack2.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  915ad2900992159bdb729b9fc4ea134b962ce32b2df0b384fee40a2c5808835d  jack2-1.9.20.tar.gz
+sha256  8b044a40ba5393b47605a920ba30744fdf8bf77d210eca90d39c8637fe6bc65d  jack2-1.9.21.tar.gz
 sha256  d8c320ffc0030d1b096ae4732b50d2b811cf95e9a9b7377c1127b2563e0a0388  COPYING

package/jack2/jack2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-JACK2_VERSION = 1.9.20
+JACK2_VERSION = 1.9.21
 JACK2_SITE = $(call github,jackaudio,jack2,v$(JACK2_VERSION))
 JACK2_LICENSE = GPL-2.0+ (jack server), LGPL-2.1+ (jack library)
 JACK2_LICENSE_FILES = COPYING