Bump psf/black from 23.11.0 to 26.3.0 in /.github/workflows

Bumps [psf/black](https://github.com/psf/black) from 23.11.0 to 26.3.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.11.0...26.3.0)

---
updated-dependencies:
- dependency-name: psf/black
  dependency-version: 26.3.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/checks.yml

@@ -62,7 +62,7 @@ jobs:
       - uses: isort/isort-action@master
         with:
           requirementsFiles: "requirements.txt requirements.dev.txt"
-      - uses: psf/black@23.11.0
+      - uses: psf/black@26.3.0
       - name: Comment if linting failed
         if: ${{ failure() }}
         uses: thollander/actions-comment-pull-request@v2