fix doc/environment.yml for Apple ARM

[edublancas]

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Checklist before requesting a review

• [ ] I have performed a self-review of my code
• [ ] I have added thorough tests (when necessary).
• [ ] I have added the right documentation in the docstring and changelog (when needed)

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:books: Documentation preview :books:: https://sklearn-evaluation--325.org.readthedocs.build/en/325/

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Pull Request Test Coverage Report for Build 4463221208

Warning: This coverage report may be inaccurate.

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• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.671%

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Totals
Change from base Build 4463094567:	0.0%
Covered Lines:	3555
Relevant Lines:	3878

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