CI: try fixing OpenBSD job

Author: Bodigrim

.cirrus.yml

@@ -15,9 +15,9 @@ task:
     # See https://github.com/anarazel/pg-vm-images/blob/main/packer/openbsd.pkrvars.hcl
     image: family/pg-ci-openbsd-vanilla
     platform: openbsd
-  install_script: pkg_add ghc cabal-install git autoconf-2.71
+  install_script: pkg_add ghc cabal-install git autoconf-2.72
   script:
-    - export AUTOCONF_VERSION=2.71
+    - export AUTOCONF_VERSION=2.72
     - export CABAL_DIR=/tmp/.cabal
     - ghc --version
     - cabal --version