Bump black from 21.9b0 to 21.11b1 (#3278)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Pascal Vizeli <pvizeli@syshack.ch>
Co-authored-by: Joakim Sørensen <joasoe@gmail.com>

.pre-commit-config.yaml

@@ -1,13 +1,13 @@
 repos:
   - repo: https://github.com/psf/black
-    rev: 21.9b0
+    rev: 21.11b1
     hooks:
       - id: black
         args:
           - --safe
           - --quiet
           - --target-version
-          - py38
+          - py39
         files: ^((supervisor|tests)/.+)?[^/]+\.py$
   - repo: https://gitlab.com/pycqa/flake8
     rev: 3.8.3