Downgrade black version to 23.3.0 in the CI

As of 23.10 black no longer supports python 3.7, but we still do.

.github/workflows/lint.yml

@@ -8,11 +8,13 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: psf/black@stable
+        with:
+          black-version: 23.3.0
   isort:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
           python-version: 3.7
-      - uses: isort/isort-action@master
+      - uses: isort/isort-action@master