cirrus: update freebsd images

.cirrus.yml

@@ -1,7 +1,7 @@
 task:
-  name: freebsd-10-amd64
+  name: freebsd-11-amd64
   freebsd_instance:
-    image_family: freebsd-10-4
+    image_family: freebsd-11-3-snap
   setup_script:
     - pkg install -y git sdl2 python
     - git submodule update --init --recursive
@@ -10,9 +10,9 @@ task:
     - ./scripts/build_freebsd_engine.sh
 
 task:
-  name: freebsd-11-amd64
+  name: freebsd-12-amd64
   freebsd_instance:
-    image_family: freebsd-11-3
+    image_family: freebsd-12-1
   setup_script:
     - pkg install -y git sdl2 python
     - git submodule update --init --recursive
@@ -21,9 +21,9 @@ task:
     - ./scripts/build_freebsd_engine.sh
 
 task:
-  name: freebsd-12-amd64
+  name: freebsd-13-amd64
   freebsd_instance:
-    image_family: freebsd-12-0
+    image_family: freebsd-13-0-snap
   setup_script:
     - pkg install -y git sdl2 python
     - git submodule update --init --recursive