[red-knot] use debug_assert for name ctx in infer_type_expression

Co-authored-by: Alex Waygood <alex.waygood@gmail.com>

crates/red_knot_python_semantic/src/types/infer.rs

@@ -1279,7 +1279,7 @@ impl<'db> TypeInferenceBuilder<'db> {
         //   stub of the forms other than a standalone name in scope.
         match expression {
             ast::Expr::Name(name) => {
-                assert!(
+                debug_assert!(
                     name.ctx.is_load(),
                     "name in a type expression is always 'load' but got: '{:?}'",
                     name.ctx