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```  File "/Users/---/Library/Caches/pypoetry/virtualenvs/tgfp-aa7Gkhdk-py3.10/lib/python3.10/site-packages/yaml/constructor.py", line 141, in construct_mapping
    raise ConstructorError("while constructing a mapping", node.start_mark,
yaml.constructor.ConstructorError: while constructing a mapping
  in "prefect.yaml", line 29, column 12
found unhashable key```
(line 29 is indeed the line with $NEW_VERSION)