cirrus: Update to FreeBSD 12.3

Closes: #8783
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>

.cirrus.yml

@@ -29,9 +29,9 @@ freebsd_task:
     - name: FreeBSD 13.0
       freebsd_instance:
         image_family: freebsd-13-0
-    - name: FreeBSD 12.2
+    - name: FreeBSD 12.3
       freebsd_instance:
-        image_family: freebsd-12-2
+        image_family: freebsd-12-3
 
   env:
     CIRRUS_CLONE_DEPTH: 10