update sources to Ubuntu-5.11.0-26.28

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

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

diff --git a/submodules/ubuntu-hirsute b/submodules/ubuntu-hirsute
index e7bd377c9219094136ecce5e2258f04edbed58a0..28b10a79cd47f0df03d510642e764ff300251a78 160000 (submodule)
--- a/submodules/ubuntu-hirsute
+++ b/submodules/ubuntu-hirsute
@@ -1 +1 @@
-Subproject commit e7bd377c9219094136ecce5e2258f04edbed58a0
+Subproject commit 28b10a79cd47f0df03d510642e764ff300251a78