[ty] Unexport helper function

I'm not sure if this used to be used elsewhere, but it no longer is.
And it looks like an internal-only helper function, so just un-export
it.

And note that `ModuleNameIngredient` is also un-exported, so this
function isn't really usable outside of its defining module anyway.

crates/ty_python_semantic/src/module_resolver/resolver.rs

@@ -52,7 +52,7 @@ impl ModuleResolveMode {
 /// This query should not be called directly. Instead, use [`resolve_module`]. It only exists
 /// because Salsa requires the module name to be an ingredient.
 #[salsa::tracked(heap_size=get_size2::GetSize::get_heap_size)]
-pub(crate) fn resolve_module_query<'db>(
+fn resolve_module_query<'db>(
     db: &'db dyn Db,
     module_name: ModuleNameIngredient<'db>,
 ) -> Option<Module<'db>> {