Update submodules on '5.6' in qt5

Change-Id: I5599c7876c25f21fb286013a2d8cccda5efebe02
Reviewed-by: Liang Qi <liang.qi@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

diff --git a/qtbase b/qtbase
index 2cfcd8a..10481cb 160000 (submodule)
--- a/qtbase
+++ b/qtbase
@@ -1 +1 @@
-Subproject commit 2cfcd8a63e03783b76a36a9f96ff9c754cf06294
+Subproject commit 10481cb9e7066886b9e76a286b66e54a7192a05b

diff --git a/qtserialport b/qtserialport
index 45c5130..9e4b9d2 160000 (submodule)
--- a/qtserialport
+++ b/qtserialport
@@ -1 +1 @@
-Subproject commit 45c513093c9e7c40327e2c440a0321d99de36211
+Subproject commit 9e4b9d276f0de2d298da4ffdf6f15a9960402194