Remove Int wrapper type from parser (#7577)

## Summary

This is only used for the `level` field in relative imports (e.g., `from
..foo import bar`). It seems unnecessary to use a wrapper here, so this
PR changes to a `u32` directly.

crates/ruff_python_formatter/src/statement/stmt_import_from.rs

@@ -21,7 +21,7 @@ impl FormatNodeRule<StmtImportFrom> for FormatStmtImportFrom {
         } = item;
 
         let level_str = level
-            .map(|level| ".".repeat(level.to_usize()))
+            .map(|level| ".".repeat(level as usize))
             .unwrap_or(String::default());
 
         write!(