Fix several failures due to updates of earth relief data

[seisman]

Description of proposed changes

Update some numbers due to the recent changes in GMT earth relief data.

Partially address #451.

Note: For unknown reasons, the caches of the Azure Pipelines expire and there is always a cache miss.
Each CI job will download the data files from the GMT data server.

It seems the long-time internet connection issue in Azure Pipelines is gone, and all files are downloaded without timeouts.

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If adding new functionality, add an example to docstrings or tutorials.

[weiji14]

Note: For unknown reasons, the caches of the Azure Pipelines expire and there is always a cache miss.
Each CI job will download the data files from the GMT data server.

It seems the long-time internet connection issue in Azure Pipelines is gone, and all files are downloaded without timeouts.

Does that mean we don't need the cross-platform workaround as in #438 anymore?

[seisman]

Note: For unknown reasons, the caches of the Azure Pipelines expire and there is always a cache miss.
Each CI job will download the data files from the GMT data server.
It seems the long-time internet connection issue in Azure Pipelines is gone, and all files are downloaded without timeouts.

Does that mean we don't need the cross-platform workaround as in #438 anymore?

Not sure. It yes, the GitHub Actions CI (#475) would be greatly simplified. 🤞

[seisman]

Now there are only 13 failures (image differences).

Two of the Windows CI jobs still fail to download the earth_relief_10m grid, leading to one more failure.

[weiji14]

Two of the Windows CI jobs still fail to download the earth_relief_10m grid, leading to one more failure.

Should we merge in #495 first then, just to update the cache key and see if will work?

[weiji14]

OR, we can merge #495 into this PR, and then merge this PR into master if the 2 tests pass for Windows.

[seisman]

I don't think PR #495 really updates the caches. Look at the latest CI reports of that PR, it still tries to download all the files.

Possibly because the caching post-job won't run if the any CI steps fail.

[weiji14]

Ah, that is super annoying. Let's just merge in this one, since it's just a problem with the cache on Windows (and not an actual problem with the function we're trying to test).

[seisman]

Should we move all the closed issues linked to the 0.2.x milestone to 0.1.x milestone?

[weiji14]

Done, and I'll move some of the open ones to 0.1.x too.