update sources to Ubuntu-5.15.0-27.28

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

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

diff --git a/submodules/ubuntu-jammy b/submodules/ubuntu-jammy
index 25a5e7755e5793015ec923172bf144ee20166d19..ab2e786e8b1e6690c98424277abe512970850bd6 160000 (submodule)
--- a/submodules/ubuntu-jammy
+++ b/submodules/ubuntu-jammy
@@ -1 +1 @@
-Subproject commit 25a5e7755e5793015ec923172bf144ee20166d19
+Subproject commit ab2e786e8b1e6690c98424277abe512970850bd6