update sources to Ubuntu-5.4.0-55.61

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

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

diff --git a/submodules/ubuntu-focal b/submodules/ubuntu-focal
index fd386a64a1ed3f2f047318508ebd733f56a4fab2..229351eb9ca03b8ccd80f80a6f36d56fa0c4e601 160000 (submodule)
--- a/submodules/ubuntu-focal
+++ b/submodules/ubuntu-focal
@@ -1 +1 @@
-Subproject commit fd386a64a1ed3f2f047318508ebd733f56a4fab2
+Subproject commit 229351eb9ca03b8ccd80f80a6f36d56fa0c4e601