package/docker-engine: bump version to 19.03.8

From the release notes:
- Improve mitigation for CVE-2019-14271 for some nscd configuration.

Signed-off-by: Christian Stewart <christian@paral.in>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/docker-engine/docker-engine.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256	6621da5b75cecd1f6f57389a4611d3dd00eeedd8765db63ae5538122fdac27da  docker-engine-19.03.7.tar.gz
+sha256	13ec45ad45091111bd566aca9d81989b3f05e0625dab68d33c3ad81ff924172f  docker-engine-19.03.8.tar.gz
 sha256	7c87873291f289713ac5df48b1f2010eb6963752bbd6b530416ab99fc37914a8  LICENSE

package/docker-engine/docker-engine.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-DOCKER_ENGINE_VERSION = 19.03.7
+DOCKER_ENGINE_VERSION = 19.03.8
 DOCKER_ENGINE_SITE = $(call github,docker,engine,v$(DOCKER_ENGINE_VERSION))
 
 DOCKER_ENGINE_LICENSE = Apache-2.0