Update doctest fixtures for consistency with xarray v2024.3.0

[thabbott]

Description

Current status of doctests in local testing:

• Using data copied gs://contrails-301217-unit-test/doc-test-cache/ fixture:
  • pass on xarray v2024.3.0
  • fail on xarray v2024.2.0
• Using data cached locally with xarray v2024.3.0
  • fail on xarray v2024.3.0
  • fail no xarray v2024.2.0
• Using data cached locally with xarray v2024.2.0
  • pass on xarray v2024.3.0
  • pass on xarray v2024.2.0

This likely indicates that doctest values are correct when running tests with a recent version of xarray (v2024.3.0 or newer) on a dirty doctest cache created using an older version of xarray (v2024.2.0 or older).

For details about xarray v2024.3.0 changes, see https://github.com/contrailcirrus/pycontrails/pull/171#issuecomment-2040527033.

Proposed solution: update doctest fixture with values cached using the current xarray version.

Details

• Version: 0.50.2
• OS: ubuntu

[thabbott]

I came back to this later in the day and can no longer reproduce this issue. Closing and will re-open if it comes up again.