Backport PR matplotlib#27606: Pin black version

tacaswell · meeseeksmachine · commit a179ea8be9ec · 2024-01-08T14:21:35.000Z
diff --git a/environment.yml b/environment.yml
@@ -62,4 +62,4 @@ dependencies:
   - pytest-xdist
   - tornado
   - pytz
-  - black
+  - black<24
diff --git a/requirements/testing/all.txt b/requirements/testing/all.txt
@@ -1,6 +1,6 @@
 # pip requirements for all the CI builds
 
-black
+black<24
 certifi
 coverage!=6.3
 psutil
