Merge pull request #28021 from charris/backport-28020

CI: pin scipy-doctest to 1.5.1

Author: charris

.github/workflows/linux.yml

@@ -188,7 +188,7 @@ jobs:
     - name: Check docstests
       shell: 'script -q -e -c "bash --noprofile --norc -eo pipefail {0}"'
       run: |
-        pip install scipy-doctest hypothesis matplotlib scipy pytz pandas
+        pip install scipy-doctest==1.5.1 hypothesis==6.104.1 matplotlib scipy pytz pandas
         spin check-docs -v
         spin check-tutorials -v
 

requirements/doc_requirements.txt

@@ -18,4 +18,4 @@ towncrier
 toml
 
 # for doctests, also needs pytz which is in test_requirements
-scipy-doctest
+scipy-doctest==1.5.1