chore(dev): bring back `builtins.toPath` for `shell.nix` convenience
chore(dev): bring back `builtins.toPath` for `shell.nix` convenience

ibis-project/ibis,ibis-project/ibis,cpcloud/ibis,ibis-project/ibis,cpcloud/ibis,ibis-project/ibis,cpcloud/ibis,cpcloud/ibis