Run Black check on all branches

Updated the GitHub Actions workflow to trigger the Black formatting check on pushes to any branch, not just master.

Author: a-spiker

.github/workflows/black_check.yml

@@ -3,7 +3,7 @@ name: Black Formatting Check
 on:
   push:
     branches:
-      - master
+      - '*'
   pull_request:
     branches:
       - master