Bump black dependency

As per psf/black#2976

Author: coretl

setup.cfg

@@ -30,10 +30,13 @@ package_dir =
 [options.extras_require]
 # For development tests/docs
 dev =
-    black==21.9b0
+    black==22.3.0
     isort>5.0
     pytest-cov
     mypy
+    # remove this dependency once flake8 has dropped "importlib-metadata <=4.3"
+    # https://github.com/PyCQA/flake8/pull/1438
+    flake8 <= 3.9.2
     flake8-isort
     sphinx-rtd-theme-github-versions
     pre-commit