Fix MDA shuffle under pandas copy-on-write#6
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rng.shuffle on a DataFrame column view raises 'ValueError: array is read-only' with pandas >= 3.0 (CoW default). Shuffle a copy, assign back. Failed on CI py3.11/3.12 (which resolve pandas 3+); py3.9/3.10 got pandas 2.x and passed.
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rng.shuffle on a column view raises 'array is read-only' with pandas >= 3 (py3.11/3.12 CI). Shuffle a copy instead. See CHANGELOG.