fix: remove unused import env in queries.rs

Rust 1.92's stricter linting caught this unused import.

Co-Authored-By: Maximilian Roos <max-sixty@users.noreply.github.com>

Author: github-actions[bot]

prqlc/prqlc/tests/integration/queries.rs

@@ -1,6 +1,6 @@
 #![cfg(not(target_family = "wasm"))]
+use std::fs;
 use std::path::Path;
-use std::{env, fs};
 
 use insta::assert_debug_snapshot;
 use insta::{assert_snapshot, with_settings};