Copy semantics change in numpy 2.0 caused incompatibility with astropy v6.1rc

[pllim]

Please see:

• Going forward after numpy 2.0's change of copy semantics astropy#16167
• Pin numpy to 2.0.0rc1 astropy-integration-testing#16
• https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword

    def test_quantity_model():
        c = modeling.models.Chebyshev1D(3)
        uc = QuantityModel(c, u.AA, u.km)
    
>       assert uc(10*u.nm).to(u.m) == 0*u.m

specutils/tests/test_utils.py:26: 
...
E       ValueError: Unable to avoid copy while creating an array as requested.
E       If using `np.array(obj, copy=False)` replace it with `np.asarray(obj)` to allow a copy when needed (no behavior change in NumPy 1.x).
E       For more details, see https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword.

Example logs:

• https://github.com/astropy/astropy-integration-testing/actions/runs/8568043943/job/23485760695?pr=16 (specutils==1.13.0)
• https://github.com/astropy/astropy-integration-testing/actions/runs/8568043943/job/23485761014?pr=16 (specutils @ git+https://github.com/astropy/specutils.git@dac04cafe03079e487c9b5351a3713f1da09f6a7)

cc @astrofrog @neutrinoceros

[pllim]

I might be able to patch this... See #1130

[pllim]

I can reproduce this error in this repo now that astropy nightly wheel upload is fixed. A previously green job now fails: https://github.com/astropy/specutils/actions/runs/8531304724/job/23500820517