COMP: Update breathe for Sphinx compatibility
COMP: Update breathe for Sphinx compatibility

To address:

 ModuleNotFoundError: No module named 'sphinx.ext.mathbase'

Adds:

 https://github.com/michaeljones/breathe/pull/469

InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples