Bump FreeBSD versions in CI.

(cherry picked from commit 9afcedc)

Author: bbannier

.cirrus.yml

@@ -721,7 +721,7 @@ docker_opensuse15_2_task:
 
 freebsd13_task:
   freebsd_instance:
-    image_family: freebsd-13-1
+    image_family: freebsd-13-2
     cpu: 8
     memory: 8GB
 
@@ -757,7 +757,7 @@ freebsd13_task:
 
 freebsd12_task:
   freebsd_instance:
-    image_family: freebsd-12-3
+    image_family: freebsd-12-4
     cpu: 8
     memory: 8GB