[Python][Packaging] Simplify Numpy resolution on python/requirements-wheel-test.txt

[asfimport]

When building the new wheels for Python 3.11 I had to modify the version of numpy manually only on python/requirements-wheel-test.txt. See: #14499

We are using oldest-supported-numpy everywhere else so I think this could be refactored to simplify the requirements-wheel-test.txt file.

I am opening this ticket as a follow up from this conversation: https://github.com/apache/arrow/pull/14499/files#r1005619591 See other PRs comment like a proposed patch and test failures as an initial investigation.

Reporter: Raúl Cumplido / @raulcd

_{Note: This issue was originally created as ARROW-18170. Please see the migration documentation for further details.}

[asfimport]

Joris Van den Bossche / @jorisvandenbossche:
I think we could also simplify this file instead. It is not needed to test with oldest-supported-numpy, since the goal of that is that it should also work on more recent versions. I am not sure why we are complex test requirements file for numpy. I would think we could just list "numpy" to get the latest numpy version that is available for the particular platform.

[asfimport]

Joris Van den Bossche / @jorisvandenbossche:
There is some related discussion about this in #11606 as well