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ARROW-17892: [CI] Use Python 3.10 in AppVeyor build (#14307)

This PR tries to upgrade Python version used in `AppVeyor` setup and removes `CONDA_DLL_SEARCH_MODIFICATION_ENABLE` as it should not be needed with Python 3.10.

Authored-by: Alenka Frim <frim.alenka@gmail.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>