monit: bump to version 5.7

CHANGES version 5.7:
https://mmonit.com/monit/dist/CHANGES.txt

Signed-off-by: Johan Derycke <johan.derycke@barco.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/monit/monit.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MONIT_VERSION = 5.6
+MONIT_VERSION = 5.7
 MONIT_SITE = http://mmonit.com/monit/dist/
 MONIT_LICENSE = AGPLv3 with OpenSSL exception
 MONIT_LICENSE_FILES = COPYING