squirrel-sql: 3.8.1 -> 3.9.0

* squirrel-sql: 3.8.1 -> 3.9.0 (#52029)

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/squirrel-sql/versions

* squirrel-sql: cleanup

* squirrel-sql: don't pass stdenv as a build input