socat: bump to version 2.0.0-b6

2.0.0-b6 fix a security issue:
Under certain circumstances an FD leak occurs and may be misused for denial of
service attacks against socat running in server mode.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/socat/socat.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SOCAT_VERSION = 2.0.0-b5
+SOCAT_VERSION = 2.0.0-b6
 SOCAT_SOURCE = socat-$(SOCAT_VERSION).tar.bz2
 SOCAT_SITE = http://www.dest-unreach.org/socat/download/
 SOCAT_LICENSE = GPLv2