Intersphinx mapping is mistargeting URLs

[effigies]

In fMRIPrep docs, we use:

:class:`niworkflows.interfaces.freesurfer.RefineBrainMask`

The resulting link is: https://www.nipreps.org/niworkflows/api/niworkflows.interfaces.freesurfer.html#niworkflows.interfaces.freesurfer.RefineBrainMask

It should be: https://www.nipreps.org/niworkflows/1.7/api/niworkflows.interfaces.freesurfer.html#niworkflows.interfaces.freesurfer.RefineBrainMask