Merge pull request #1805 from tskit-dev/dependabot/pip/requirements/CI-tests-pip/scipy-1.7.1

Bump scipy from 1.6.3 to 1.7.1 in /requirements/CI-tests-pip

Author: mergify[bot]

requirements/CI-tests-pip/requirements.txt

@@ -7,5 +7,5 @@ numpy==1.21.0
 pytest==6.2.4
 pytest-xdist==2.3.0
 python_jsonschema_objects==0.4.0
-scipy==1.6.3
+scipy==1.7.1
 tskit==0.3.6