update sources to Ubuntu-5.4.0-19.23

(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 93dfa5b8e12fed29933f3451db44d88c0e4b5aed..6102a58e0eb8bae2120fbc24e0dd207c89867603 160000 (submodule)
--- a/submodules/ubuntu-focal
+++ b/submodules/ubuntu-focal
@@ -1 +1 @@
-Subproject commit 93dfa5b8e12fed29933f3451db44d88c0e4b5aed
+Subproject commit 6102a58e0eb8bae2120fbc24e0dd207c89867603