Merge pull request #1055 from tskit-dev/dependabot/pip/python/requirements/CI-docs/breathe-4.24.0

Bump breathe from 4.23.0 to 4.24.0 in /python/requirements/CI-docs

Author: mergify[bot]

python/requirements/CI-docs/requirements.txt

@@ -1,6 +1,6 @@
 attrs==20.2.0
 autodocsumm==0.1.13 #Pinned as errors on 0.2.0
-breathe==4.23.0
+breathe==4.24.0
 h5py==3.1.0
 jsonschema==3.2.0
 numpy==1.19.4