spectral-cube tutorial: unpin numpy dep

Author: jeffjennings

tutorials/spectral-cube-reprojection/requirements.txt

@@ -1,6 +1,6 @@
 astropy
 dask
-numpy==1.26.4 # pinned on 09-27-24; can remove pin when https://github.com/radio-astro-tools/spectral-cube/pull/917 is merged
+numpy
 radio_beam
 reproject
 spectral_cube @ git+https://github.com/radio-astro-tools/spectral-cube  # as of: 2024-10-10 for issue with 'distutils'