update sources to Ubuntu-5.0.0-18.19

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

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

diff --git a/submodules/ubuntu-disco b/submodules/ubuntu-disco
index 8eaed8ddd8ca42015675443959902509de37aa4f..fdc10a3711d4cb8ae2c42efb2c89dcca919d1e4d 160000 (submodule)
--- a/submodules/ubuntu-disco
+++ b/submodules/ubuntu-disco
@@ -1 +1 @@
-Subproject commit 8eaed8ddd8ca42015675443959902509de37aa4f
+Subproject commit fdc10a3711d4cb8ae2c42efb2c89dcca919d1e4d