Bump psf/black from 26.1.0 to 26.3.0 in /.github/workflows

Bumps [psf/black](https://github.com/psf/black) from 26.1.0 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@26.1.0...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/python-app.yml

@@ -36,7 +36,7 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
-      - uses: psf/black@26.1.0
+      - uses: psf/black@26.3.0
 
   pylint:
     runs-on: ubuntu-latest