Cirrus CI: Do not test on FreeBSD 14.0. [skip ci]

Buildbot does it now.

Author: infrastation

.cirrus.yml

@@ -8,13 +8,9 @@ freebsd_task:
   freebsd_instance:
     # FreeBSD fails to start with 1 GB. 8 CPUs max concurrency.
     # The number of CPU cores must be either 1 or a multiple of 2.
-    matrix:
-      - image_family: freebsd-13-3
-        cpu: 2
-        memory: 2G
-      - image_family: freebsd-14-0
-        cpu: 2
-        memory: 2G
+    cpu: 2
+    memory: 2G
+    image_family: freebsd-13-3
   env:
     IGNORE_OSVERSION: yes
     MAKEFLAGS: -j 3