red-knot: move symbol lookups in symbol.rs

Author: dhruvmanila

crates/red_knot_python_semantic/src/lib.rs

@@ -24,7 +24,6 @@ mod python_version;
 pub mod semantic_index;
 mod semantic_model;
 pub(crate) mod site_packages;
-mod stdlib;
 mod suppression;
 pub(crate) mod symbol;
 pub mod types;