fix: minor CI fix for test case

Author: khanhtranngoccva

tests/fixtures/hello_fs.rs

@@ -137,4 +137,4 @@ impl Filesystem for HelloFS {
         }
         reply.ok();
     }
-}
+}

tests/fixtures/mod.rs

@@ -1 +1 @@
-pub mod hello_fs;
+pub mod hello_fs;