Fix clippy

This removes an extra unnecessary semicolon that `clippy` has
recently begun to catch, causing CI to fail with:

    error: unnecessary semicolon
      --> gix-transport/src/client/blocking_io/http/traits.rs:30:18
       |
    30 |                 };
       |                  ^ help: remove
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_semicolon
       = note: `-D clippy::unnecessary-semicolon` implied by `-D warnings`
       = help: to override `-D warnings` add `#[allow(clippy::unnecessary_semicolon)]`

While it looks like this might first have been observed in GitoxideLabs#1917,
it is unrelated to any change there. It happens when the current
tip of main (4660f7a) is rerun, as observed in:
https://github.com/EliahKagan/gitoxide/actions/runs/14254079128/job/39958292846

Author: EliahKagan

gix-transport/src/client/blocking_io/http/traits.rs

@@ -27,7 +27,7 @@ impl crate::IsSpuriousError for Error {
                 #[cfg(feature = "http-client-reqwest")]
                 if let Some(err) = source.downcast_ref::<crate::client::http::reqwest::remote::Error>() {
                     return err.is_spurious();
-                };
+                }
                 false
             }
             _ => false,