limit_to_common_varietals is missing a sort

[hackalog]

I think there's a reproducibility failure there

[acwooding]

Have a version of the test failure captured here:

DEBUG    src.log:transformer_functions.py:204 Loading wine_reviews_130k...
DEBUG    src.log:transformer_functions.py:213 Applying data function...
INFO     src.log:datasets.py:2047 Generated output datasets: ['wine_reviews_130k_varietals_75'] via edge:'_wine_reviews_130k_varietals_75'
DEBUG    src.log:datasets.py:545 Updating hashes for dataset 'wine_reviews_130k_varietals_75': {'hashes': {'data': 'sha1:8b234d7595929d589c1a6781730fcb5b75e351e2', 'target': 'sha1:38f65f3b11da4851aaaccc19b1f0cf4d3806f83b'}}.
WARNING  src.log:datasets.py:2067 Hash Validation Failed. Dataset:'wine_reviews_130k_varietals_75' hashes:{'data': 'sha1:8b234d7595929d589c1a6781730fcb5b75e351e2', 'target': 'sha1:38f65f3b11da4851aaaccc19b1f0cf4d3806f83b'} do not match catalog hashes:{'data': 'sha1:d76d24f6ecd309aec82545c39af107c82edebc2f', 'target': 'sha1:38f65f3b11da4851aaaccc19b1f0cf4d3806f83b'}
DEBUG    src.log:datasets.py:2077 process_edge: Reloading Dataset catalog after processing edge:'_wine_reviews_130k_varietals_75'
DEBUG    src.log:catalog.py:81 Loaded 4 records from 'datasets' Catalog.
DEBUG    src.log:catalog.py:188 Verifying serialization for catalog 'datasets'
ERROR    src.log:datasets.py:2160 Generation from DatasetGraph failed.