fixing mypy

Author: chelsea-lin

tests/system/small/operations/test_strings.py

@@ -639,7 +639,7 @@ def test_getitem_w_struct_array():
             ("age", pa.int64()),
         ]
     )
-    data = [
+    data: list[list[dict]] = [
         [
             {"name": "Alice", "age": 30},
             {"name": "Bob", "age": 25},

third_party/bigframes_vendored/pandas/core/strings/accessor.py

@@ -13,7 +13,7 @@ class StringMethods:
     R's stringr package.
     """
 
-    def __getitem__(self, pat: str, flags: int = 0):
+    def __getitem__(self, key: int | slice):
         """
         Index or slice string or list in the Series.