pgsql: ci: remove minor version from freebsd image name

ci: remove minor version from freebsd image name This way .cirrus.yml does not need to be changed just because freebsd releases a new minor version. Discussion: https://postgr.es/m/[email protected] Backpatch: 15-, just like the CI support Branch -- REL_15_ST

pgsql: ci: remove minor version from freebsd image name

ci: remove minor version from freebsd image name This way .cirrus.yml does not need to be changed just because freebsd releases a new minor version. Discussion: https://postgr.es/m/[email protected] Backpatch: 15-, just like the CI support Branch -- master D