update sources to Ubuntu-4.13.0-19.22

diff --git a/submodules/ubuntu-artful b/submodules/ubuntu-artful
index f8995fa6521396bcd5723696b0cabdb615e692da..a2d46e16208b74981109f721864f4ea65de77dcb 160000 (submodule)
--- a/submodules/ubuntu-artful
+++ b/submodules/ubuntu-artful
@@ -1 +1 @@
-Subproject commit f8995fa6521396bcd5723696b0cabdb615e692da
+Subproject commit a2d46e16208b74981109f721864f4ea65de77dcb