Pytest: Ignore DeprecationWarning from pandas

[smithara]

This fixes CI failure from Pandas warning about Pyarrow:

E   DeprecationWarning: 
E   Pyarrow will become a required dependency of pandas in the next major release of pandas (pandas 3.0),
E   (to allow more performant data types, such as the Arrow string type, and better interoperability with other libraries)
E   but was not found to be installed on your system.
E   If this would cause problems for you,
E   please provide us feedback at https://github.com/pandas-dev/pandas/issues/54466