mkosi: Update centos to latest

Due to dependabot and pagure not playing nice with each other, we're
going to have to update this one manually for a while.

See https://github.com/systemd/systemd/issues/31773

diff --git a/pkg/centos b/pkg/centos
index 3cf45106c8bc5a050901851be6b2ac85b6f5c571..eef64f0d4ddca0f151a9680660a9ba97604e0e88 160000 (submodule)
--- a/pkg/centos
+++ b/pkg/centos
@@ -1 +1 @@
-Subproject commit 3cf45106c8bc5a050901851be6b2ac85b6f5c571
+Subproject commit eef64f0d4ddca0f151a9680660a9ba97604e0e88