Bump versions in .cirrus.yml (#651)

...with the hope of un-breaking the FreeBSD job.

.cirrus.yml

@@ -1,7 +1,7 @@
 task:
  name: FreeBSD
  freebsd_instance:
- image_family: freebsd-13-1
+ image_family: freebsd-13-2
  install_script: pkg install -y ghc hs-cabal-install git
  script:
  - cabal update
@@ -13,7 +13,7 @@ task:
  image_project: pg-ci-images
  # OpenBSD version should match
  # https://github.com/anarazel/pg-vm-images/blob/main/packer/openbsd.pkrvars.hcl
- image: family/pg-ci-openbsd-vanilla-7-2
+ image: family/pg-ci-openbsd-vanilla-7-3
  platform: openbsd
  install_script: pkg_add ghc cabal-install git
  script: