Fix pyright error.

Author: Yhg1s

Diff for: bench_runner/scripts/run_benchmarks.py

@@ -66,7 +66,7 @@ def run_benchmarks(
     benchmarks: str,
     /,
     test_mode: bool = False,
-    extra_args: Iterable[str] | None = None,
+    extra_args: list[str] | None = None,
 ) -> None:
     if benchmarks.strip() == "":
         benchmarks = "all"