Bump php-opencloud/openstack from 3.0.6 to 3.0.7

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

diff --git a/3rdparty b/3rdparty
index 94e6a62bb98d6bab68206e4624a62064f4f15a8c..7f4a8f54d850a92e50e143d8ef4d59ae8cca73ac 160000 (submodule)
--- a/3rdparty
+++ b/3rdparty
@@ -1 +1 @@
-Subproject commit 94e6a62bb98d6bab68206e4624a62064f4f15a8c
+Subproject commit 7f4a8f54d850a92e50e143d8ef4d59ae8cca73ac