Fix quirk of enum values in Python

[honnibal]

After the Cython 3 change, the types of enum members such as spacy.parts_of_speech.NOUN became 'flag', rather than simple 'int'. This change mostly doesn't matter because the flag type does duck-type like an int -- it compares, additions, prints etc the same. However, it doesn't repr the same and if you do an isinstance check it will fail. It's therefore better to just make them ints like they were before.

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• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.