chore: update deny and audit

The deny tooling removed many of the keys that were in the `deny.toml`.

The auditing of the repository reported that `proc-macro-error` is
unmaintained ([RUSTSEC-2024-0370]). This is replaced with the fork, `proc-macro-error2`,
which is a drop-in replacement.

It also produced a vulnerability report ([RUSTSEC-2024-0421]) for the
`idna` crate, a transitive dependency of `url`. This is fixed by
pinning `url` to `>= 2.5.4`

[RUSTSEC-2024-0370]: https://rustsec.org/advisories/RUSTSEC-2024-0370
[RUSTSEC-2024-0421]: https://rustsec.org/advisories/RUSTSEC-2024-0421
It also pins `url` to be `>= 2.5.4`, since

radicle-git-ext/git-ref-format/macro/Cargo.toml

@@ -13,7 +13,7 @@ proc-macro = true
 test = false
 
 [dependencies]
-proc-macro-error = "1.0.4"
+proc-macro-error2 = "2"
 quote = "1"
 syn = "2"
 

radicle-git-ext/git-ref-format/macro/src/lib.rs

@@ -4,12 +4,12 @@
 // Linking Exception. For full terms see the included LICENSE file.
 
 #[macro_use]
-extern crate proc_macro_error;
+extern crate proc_macro_error2;
 
 use std::convert::TryInto;
 
 use proc_macro::TokenStream;
-use proc_macro_error::abort;
+use proc_macro_error2::abort;
 use quote::quote;
 use syn::{parse_macro_input, LitStr};