CI: Update FreeBSD to 13.1

Also print the compiler version before starting.  It's not easy to find
otherwise, and does change from time to time.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

.cirrus.yml

@@ -10,6 +10,7 @@ freebsd_template: &FREEBSD_TEMPLATE
                                  libxml2 glib git
 
   build_script:
+    - cc --version
     - ./configure --with-system-seabios=/usr/local/share/seabios/bios.bin
     - gmake -j`sysctl -n hw.ncpu` clang=y
 
@@ -22,7 +23,7 @@ task:
 task:
   name: 'FreeBSD 13'
   freebsd_instance:
-    image_family: freebsd-13-0
+    image_family: freebsd-13-1
   << : *FREEBSD_TEMPLATE
 
 task: