chore: silence unused-import warning in test_ibe macro

The `use super::*;` glob in test_ibe! is required (the macro body
references PublicKey, SecretKey, UserSecretKey, CipherText, Msg, IBE,
and the scheme type from the parent module), but clippy reports it as
unused because not every call site exercises every re-export the same
way. Annotate with #[allow(unused_imports)] to suppress the false
positive without dropping the import.

Closes #33

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: dobby-coder[bot]

src/test_macros.rs

@@ -98,6 +98,7 @@ macro_rules! test_multi_kem {
 
 macro_rules! test_ibe {
     ($name: ident) => {
+        #[allow(unused_imports)]
         use super::*;
         use crate::Derive;