update sources to Ubuntu-5.0.0-28.30

(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 caa19397f6eb68a4f9bb252eceb5b4c0f23f1512..49ccb5a45b29094a53b29ee49b8c9f9f985bb23a 160000 (submodule)
--- a/submodules/ubuntu-disco
+++ b/submodules/ubuntu-disco
@@ -1 +1 @@
-Subproject commit caa19397f6eb68a4f9bb252eceb5b4c0f23f1512
+Subproject commit 49ccb5a45b29094a53b29ee49b8c9f9f985bb23a