update sources to Ubuntu-4.13.0-40.45

(generated with debian/scripts/import-upstream-tag)

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/submodules/ubuntu-artful b/submodules/ubuntu-artful
index 097ff12866439027cae08b9a6a2f73bc2731750f..4b552a65f2cd5f8a4660072330c0cba67a30f647 160000 (submodule)
--- a/submodules/ubuntu-artful
+++ b/submodules/ubuntu-artful
@@ -1 +1 @@
-Subproject commit 097ff12866439027cae08b9a6a2f73bc2731750f
+Subproject commit 4b552a65f2cd5f8a4660072330c0cba67a30f647