ci: no longer build Oriole QEMU artifact

Said artifact is no longer being used. If needed in the future, it can
be trivially reintroduced, but in the meantime there's no reason to
expend resources on them.

Author: darora

.github/workflows/qemu-image-build.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set PostgreSQL versions - only builds pg17 atm
         id: set-versions
         run: |
-          VERSIONS=$(nix run nixpkgs#yq --  '.postgres_major[1,2]' ansible/vars.yml | nix run nixpkgs#jq -- -R -s -c 'split("\n")[:-1]')
+          VERSIONS=$(nix run nixpkgs#yq --  '.postgres_major[1]' ansible/vars.yml | nix run nixpkgs#jq -- -R -s -c 'split("\n")[:-1]')
           echo "postgres_versions=$VERSIONS" >> $GITHUB_OUTPUT
 
   build: