docs: Update scipy intersphinx url to drop 'reference' (#1767)

* Update scipy scipy intersphinx url to target 'https://docs.scipy.org/doc/scipy/objects.inv'
to avoid redirect from 'https://docs.scipy.org/doc/scipy/reference/'.
   - This is the result of SciPy changing the location in scipy v1.8.0.

docs/conf.py

@@ -73,7 +73,7 @@ def setup(app):
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3', None),
     'numpy': ('https://numpy.org/doc/stable/', None),
-    'scipy': ('https://docs.scipy.org/doc/scipy/reference/', None),
+    'scipy': ('https://docs.scipy.org/doc/scipy/', None),
     'matplotlib': ('https://matplotlib.org/stable/', None),
     'iminuit': ('https://iminuit.readthedocs.io/en/stable/', None),
     'uproot': ('https://uproot.readthedocs.io/en/latest/', None),

tests/test_optim.py

@@ -9,7 +9,7 @@
 import numpy as np
 
 
-# from https://docs.scipy.org/doc/scipy/reference/tutorial/optimize.html#nelder-mead-simplex-algorithm-method-nelder-mead
+# from https://docs.scipy.org/doc/scipy/tutorial/optimize.html#nelder-mead-simplex-algorithm-method-nelder-mead
 @pytest.mark.skip_pytorch
 @pytest.mark.skip_pytorch64
 @pytest.mark.skip_tensorflow