Bring pyarray and pytensor up to date with xtensor 0.20.0

[yungyuc]

In https://github.com/QuantStack/xtensor/commit/bfa8879a18615ae39874c79a992b4b39843b3ca9 , 3 type aliases introduced to xcontainer_inner_types specialization:

• using reference = typename storage_type::reference;
• using const_reference = typename storage_type::const_reference;
• using size_type = typename storage_type::size_type;

They should be added to xtensor-python to keep it working for xtensor 0.20.0.

[JohanMabille]

Thanks for this fix!

[wolfv]

awesome!

[yungyuc]

Thanks a lot for accepting this.

[SylvainCorlay]

Thank you for contributing. we will be pushing out releases very soon.