test: pin to older pandas-stubs (#1477)

Author: tswast

noxfile.py

@@ -256,7 +256,8 @@ def mypy(session):
         set(
             [
                 "mypy",
-                "pandas-stubs",
+                # TODO: update to latest pandas-stubs once we resolve bigframes issues.
+                "pandas-stubs<=2.2.3.241126",
                 "types-protobuf",
                 "types-python-dateutil",
                 "types-requests",