Backport PR matplotlib#27858: pin pytest

Author: tacaswell

environment.yml

@@ -55,7 +55,7 @@ dependencies:
   - psutil
   - pre-commit
   - pydocstyle>=5.1.0
-  - pytest!=4.6.0,!=5.4.0
+  - pytest!=4.6.0,!=5.4.0,!=8.1.0
   - pytest-cov
   - pytest-rerunfailures
   - pytest-timeout

requirements/testing/all.txt

@@ -4,7 +4,7 @@ black<24
 certifi
 coverage!=6.3
 psutil
-pytest!=4.6.0,!=5.4.0
+pytest!=4.6.0,!=5.4.0,!=8.1.0
 pytest-cov
 pytest-rerunfailures
 pytest-timeout