Merge pull request #53 from arduino/dependabot/pip/black-21.7b0

Bump black from 21.6b0 to 21.7b0

Author: per1234

poetry.lock

@@ -11,7 +11,7 @@ python = "^3.9"
 invoke = "1.6.0"
 pytest = "6.2.4"
 
-black = { version = "^21.6b0", allow-prereleases = true }
+black = { version = "^21.7b0", allow-prereleases = true }
 codespell = ">=2.0.0"
 flake8 = "^3.9.2"
 pep8-naming = "^0.12.0"