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ARROW-14968: [Python] Pin numpy build dependency using oldest-supported-numpy

`oldest-supported-numpy` is a meta-package which defines the numpy version pins across platforms and python versions, this should make the python package maintenance easier and more future-proof.

cc @jorisvandenbossche

Closes #11606 from kszucs/oldest-numpy

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>