Pin black version in github action.

Diptorup Deb · Diptorup Deb · commit 1aaca2d8e34d · 2023-02-03T21:25:05.000-06:00
diff --git a/.github/workflows/black.yml b/.github/workflows/black.yml
@@ -27,3 +27,4 @@ jobs:
       - uses: psf/black@stable
         with:
           args: ". --check"
+          version: "23.1.0"
