Remove non-needed clones

I am not certain if this will improve performance,
but it seems having a .clone() without any need should be removed.

This was done with clippy, and manually reviewed:

```
cargo clippy --fix -- -A clippy::all -D clippy::redundant_clone
```

crates/proc-macro-srv/src/abis/mod.rs

@@ -117,7 +117,7 @@ impl Abi {
                 let inner = unsafe { Abi_1_63::from_lib(lib, symbol_name) }?;
                 Ok(Abi::Abi1_63(inner))
             }
-            _ => Err(LoadProcMacroDylibError::UnsupportedABI(info.version_string.clone())),
+            _ => Err(LoadProcMacroDylibError::UnsupportedABI(info.version_string)),
         }
     }