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model: Fix hypothesis integration with attr < 21.3.0

Antoine Lambert requested to merge generated-differential-D8688-source into generated-differential-D8688-target

When using attr < 21.3.0, adding field transformer breaks attrs integration with hypothesis, because attributes transformed with such function are not casted to generated AttrsClass, but remains just an list of attributes. This causes error in hypothesis by raising an AttributeError.

As we use attr 21.2.0 in production and when building debian buster package, add a workaround for that issue as explained here: https://github.com/python-attrs/attrs/issues/821.

This fixes debian buster package build for swh-model.

Migrated from D8688 (view on Phabricator)

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