iperf3: bump to version 3.1.2

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

package/iperf3/iperf3.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256	86f292e554d42d1bddbd5f587e594005f4ca202c284e4da45ed8cfbe935a5be8	iperf3-3.1.1.tar.gz
+sha256  48b5c783bb4a9c44f2bdcfe52c5d45b77ab1e1c82de3d0131f692457950811f9  iperf3-3.1.2.tar.gz

package/iperf3/iperf3.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-IPERF3_VERSION = 3.1.1
+IPERF3_VERSION = 3.1.2
 IPERF3_SITE = $(call github,esnet,iperf,$(IPERF3_VERSION))
 IPERF3_LICENSE = BSD-3c, BSD-2c, MIT
 IPERF3_LICENSE_FILES = LICENSE