Merge pull request #187 from arduino/dependabot/pip/black-21.12b0

Bump black from 21.11b1 to 21.12b0

Author: per1234

poetry.lock

@@ -13,7 +13,7 @@ python = "^3.9"
 [tool.poetry.dev-dependencies]
 yamllint = "^v1.26.3"
 codespell = "^2.1.0"
-black = "^21.11b1"
+black = "^21.12b0"
 flake8 = "^4.0.1"
 pep8-naming = "^0.12.1"
 pytest = "^6.2.5"