update ci to 5.12.3

Author: Skycoder42

.travis.yml

@@ -10,7 +10,7 @@ osx_image: xcode10.1
 env:
   global:
     - QDEP_CACHE_DIR=$HOME/.qdep-cache
-    - QT_VER=5.12.2
+    - QT_VER=5.12.3
     - DOCKER_IMAGE=common
     - EXTRA_MODULES=".skycoder42.jsonserializer .skycoder42.service"
     - MAKE_RUN_TESTS=true

appveyor.yml

@@ -4,7 +4,7 @@ image:
 version: build-{build}
 
 environment:
-  QT_VER: 5.12.2
+  QT_VER: 5.12.3
   EXTRA_MODULES: .qtremoteobjects;.skycoder42.jsonserializer;.skycoder42.service
   MAKE_RUN_TESTS: true
   TARGET_NAME: qtdatasync