Remove old scanpydoc workaround

Author: tomwhite

requirements-doc.txt

@@ -2,9 +2,6 @@ myst_nb
 pydata-sphinx-theme
 sphinx>4,<=4.2.0
 sphinx_autodoc_typehints>=1.14.0
-# Work around problem with autodoc_typehints
-# https://github.com/theislab/scanpydoc/pull/32
-git+https://github.com/theislab/scanpydoc.git#egg=scanpydoc
 sphinx-book-theme
 scanpydoc
 ipython