Merge pull request #4545 from facebook/cirrusci_bsd_fix

[ci] update freebsd image

.cirrus.yml

@@ -2,7 +2,7 @@ task:
   name: FreeBSD (make check)
   freebsd_instance:
     matrix:
-      image_family: freebsd-14-2
+      image_family: freebsd-15-0-amd64-zfs
   install_script: pkg install -y gmake coreutils
   script: |
     MOREFLAGS="-Werror" gmake -j all