fix miri target information for Test step

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/build_steps/test.rs

@@ -629,7 +629,7 @@ impl Step for Miri {
             SourceType::InTree,
             &[],
         );
-        let _guard = builder.msg_sysroot_tool(Kind::Test, compiler.stage, "miri", host, host);
+        let _guard = builder.msg_sysroot_tool(Kind::Test, compiler.stage, "miri", host, target);
 
         cargo.add_rustc_lib_path(builder, compiler);