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GH-39848: [Python][Packaging] Build pyarrow wheels with numpy RC instead of nightly (#41097)

### Rationale for this change

Now NumPy has released a first RC for 2.0, we should update our PyArrow wheels to build with this released version instead of with the nightly numpy packages, to ensure we don't build our release wheels with an unstable numpy version.

### What changes are included in this PR?

Increased the version requirement for numpy for the installed packages at build time to `numpy>=2.0.0rc1`, to force installing this RC instead of numpy 1.26

### Are these changes tested?

The wheel tests ensure that those wheels still work with older versions of numpy
* GitHub Issue: #39848

Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>