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Pants

This stopped being valid BUILD file code in `2.17.1` . I didn't see any mention of it in the release notes. Was that intended?
```# BUILD file code
__defaults__(python_sources=dict(skip_yapf=True))

# produces
MappingError: Failed to parse ./some/path/to/BUILD.pants:
TypeError: set_defaults() got an unexpected keyword argument 'python_sources'```

aha!
yea, that didn’t do what you thought it did. So before it got silently ignored, now we error :slightly_smiling_face:
right is:
```__defaults__(dict(python_sources=dict(skip_yapf=True)))```
or, we usually use dict literals for the enclosing one:
```__defaults__({python_sources: dict(skip_yapf=True)})```

my apologies, the issue was reported here <https://github.com/pantsbuild/pants/issues/19158> but the fix for it was applied along with the fix for another issue, so didn’t get a mention in the bugfixes section in the changelog.

lesson learned. :slightly_smiling_face: