Use nightly rustfmt with rustfmt.toml (#536)

examples/generate_source_code.rs

@@ -2,10 +2,9 @@ use std::path::PathBuf;
 
 use anyhow::Result;
 use clap::Parser;
-use rustpython_parser::parser;
-
 use ruff::code_gen::SourceGenerator;
 use ruff::fs;
+use rustpython_parser::parser;
 
 #[derive(Debug, Parser)]
 struct Cli {