CI VMs: bump, to debian with cgroups v2

Per consent in 2024-03-20 Planning, remove support for cgroups v1.
And, per discovery on 2024-05-28, systemd 256 no longer even
boots on a cgroups v1 system.

This commit switches to VMs built in:

  containers/automation_images#338

...in which Debian is now cgroups v2 with crun.

Signed-off-by: Ed Santiago <santiago@redhat.com>

.cirrus.yml

@@ -32,7 +32,7 @@ env:
     DEBIAN_NAME: "debian-13"
 
     # Image identifiers
-    IMAGE_SUFFIX: "c20240411t124913z-f39f38d13"
+    IMAGE_SUFFIX: "c20240528t194313z-f40f39d13"
     FEDORA_CACHE_IMAGE_NAME: "fedora-${IMAGE_SUFFIX}"
     PRIOR_FEDORA_CACHE_IMAGE_NAME: "prior-fedora-${IMAGE_SUFFIX}"
     DEBIAN_CACHE_IMAGE_NAME: "debian-${IMAGE_SUFFIX}"