pin black version to 24.X, because new 25.X breaks style

Author: giampaolo

.github/workflows/build.yml

@@ -98,7 +98,7 @@ jobs:
         python-version: 3.x
     - name: 'Run linters'
       run: |
-        python3 -m pip install ruff black rstcheck toml-sort sphinx
+        python3 -m pip install ruff black==24.10.0 rstcheck toml-sort sphinx
         make lint-all
 
   # Produce wheels as artifacts.