git-ref-format/macro: Use proc-macro-error3 over proc-macro-error2

`proc-macro-error2` is now unmaintained[^0].
Use `proc-macro-error3` as the new drop-in replacement.

[^0]: https://rustsec.org/advisories/RUSTSEC-2026-0173

Cargo.lock

@@ -288,7 +288,7 @@ name = "git-ref-format-macro"
 version = "0.6.0"
 dependencies = [
  "git-ref-format-core",
- "proc-macro-error2",
+ "proc-macro-error3",
  "quote",
  "syn",
 ]
@@ -626,22 +626,22 @@ dependencies = [
 ]
 
 [[package]]
-name = "proc-macro-error-attr2"
-version = "2.0.0"
+name = "proc-macro-error-attr3"
+version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96de42df36bb9bba5542fe9f1a054b8cc87e172759a1868aa05c1f3acc89dfc5"
+checksum = "34e4dd828515431dd6c4a030d26f7eaed7dd4778226e9d2bb968d65ca4ec3d4d"
 dependencies = [
  "proc-macro2",
  "quote",
 ]
 
 [[package]]
-name = "proc-macro-error2"
-version = "2.0.1"
+name = "proc-macro-error3"
+version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "11ec05c52be0a07b08061f7dd003e7d7092e0472bc731b4af7bb1ef876109802"
+checksum = "5ee475e440453418ff1335189eddf7101ba502cd818ab7ae04209bc83aa925aa"
 dependencies = [
- "proc-macro-error-attr2",
+ "proc-macro-error-attr3",
  "proc-macro2",
  "quote",
  "syn",

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

@@ -16,7 +16,7 @@ proc-macro = true
 test = false
 
 [dependencies]
-proc-macro-error2 = "2"
+proc-macro-error3 = "3"
 quote = "1"
 syn = "2"
 

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

@@ -1,10 +1,10 @@
 #[macro_use]
-extern crate proc_macro_error2;
+extern crate proc_macro_error3;
 
 use std::convert::TryInto;
 
 use proc_macro::TokenStream;
-use proc_macro_error2::abort;
+use proc_macro_error3::abort;
 use quote::quote;
 use syn::{parse_macro_input, LitStr};