CI: Update to latest FreeBSD 16

lovell · lovell · commit 7b4c4762432b · 2025-12-16T19:59:31.000Z
diff --git a/.cirrus.yml b/.cirrus.yml
@@ -1,5 +1,5 @@
 freebsd_instance:
-  image_family: freebsd-15-0
+  image_family: freebsd-16-0-snap
 
 task:
   name: FreeBSD
