Ugprade black code formatter to the latest version

Author: seratch

setup.py

@@ -25,12 +25,12 @@
     "pytest-cov>=2,<3",
     "codecov>=2,<3",
     "flake8>=3,<4",
-    "black==21.6b0",
+    "black==21.7b0",
     "psutil>=5,<6",
     "databases>=0.3",
 ]
 codegen_dependencies = [
-    "black==21.6b0",
+    "black==21.7b0",
 ]
 
 needs_pytest = {"pytest", "test", "ptr"}.intersection(sys.argv)

slack_sdk/oauth/authorize_url_generator/__init__.py

@@ -34,6 +34,7 @@ def generate(self, state: str):
 
 class OpenIDConnectAuthorizeUrlGenerator:
     """Refer to https://openid.net/specs/openid-connect-core-1_0.html"""
+
     def __init__(
         self,
         *,