package/opencv3: bump to version 3.4.13

https://github.com/opencv/opencv/wiki/ChangeLog#version3413

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/opencv3/opencv3.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  c8919dfb5ead6be67534bf794cb0925534311f1cd5c6680f8164ad1813c88d13  opencv3-3.4.12.tar.gz
+sha256  70230049194ae03ed8bfaab6cd1388569aa1b5c482d8b50d3af1cd2ae5a0b95d  opencv3-3.4.13.tar.gz
 sha256  a5a7cf90fe5ac9763baad852cf69cf9d9b89bff934a679fdc5c8fcecaeba9a25  LICENSE

package/opencv3/opencv3.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-OPENCV3_VERSION = 3.4.12
+OPENCV3_VERSION = 3.4.13
 OPENCV3_SITE = $(call github,opencv,opencv,$(OPENCV3_VERSION))
 OPENCV3_INSTALL_STAGING = YES
 OPENCV3_LICENSE = BSD-3-Clause