rustfmt: update to edition 2024

We can delete rustfmt.toml as the style version defaults to
the crate's rust edition.

Author: phip1611

rustfmt.toml

@@ -7,11 +7,11 @@ extern crate proc_macro;
 use proc_macro::TokenStream;
 
 use proc_macro2::TokenStream as TokenStream2;
-use quote::{quote, quote_spanned, TokenStreamExt};
+use quote::{TokenStreamExt, quote, quote_spanned};
 use syn::spanned::Spanned;
 use syn::{
-    parse_macro_input, parse_quote, parse_quote_spanned, Error, Expr, ExprLit, ExprPath, ItemFn,
-    ItemStruct, Lit, Visibility,
+    Error, Expr, ExprLit, ExprPath, ItemFn, ItemStruct, Lit, Visibility, parse_macro_input,
+    parse_quote, parse_quote_spanned,
 };
 
 macro_rules! err {
@@ -74,7 +74,7 @@ pub fn unsafe_protocol(args: TokenStream, input: TokenStream) -> TokenStream {
                 expr,
                 "macro input must be either a string literal or path to a constant"
             )
-            .into()
+            .into();
         }
     };