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GH-44277: [CI] Use Miniforge instead of Mambaforge (#44278)

Mambaforge is being deprecated upstream in favor of Miniforge: https://conda-forge.org/news/2024/07/29/sunsetting-mambaforge/

* GitHub Issue: #44277

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>