[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

narwhals/_arrow/series.py

@@ -80,7 +80,7 @@ def std(self, ddof: int = 1) -> int:
 
     def count(self) -> int:
         pc = get_pyarrow_compute()
-        return pc.count(self._native_series) # type: ignore[no-any-return]
+        return pc.count(self._native_series)  # type: ignore[no-any-return]
 
     def __narwhals_namespace__(self) -> ArrowNamespace:
         return ArrowNamespace(backend_version=self._backend_version)