Fix issues the latest version of clippy picks up

Prior to this, these lines caused errors when linting rust.

Author: seddonym

rust/src/graph/mod.rs

@@ -229,7 +229,7 @@ impl GraphWrapper {
             if self.is_module_squashed(&ancestor_module).unwrap_or(false) {
                 return Err(PyValueError::new_err(format!(
                     "Module is a descendant of squashed module {}.",
-                    &ancestor_module,
+                    ancestor_module,
                 )));
             };
         }

rust/src/import_parsing.rs

@@ -96,15 +96,15 @@ impl<'a> StatementVisitor<'a> for Visitor<'a> {
                             format!(
                                 "{}{}.{}",
                                 ".".repeat(import_from_stmt.level as usize),
-                                &module.id,
-                                &name.name.id
+                                module.id,
+                                name.name.id
                             )
                         }
                         None => {
                             format!(
                                 "{}{}",
                                 ".".repeat(import_from_stmt.level as usize),
-                                &name.name.id
+                                name.name.id
                             )
                         }
                     };