[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/tox/config/__init__.py

@@ -309,7 +309,7 @@ def parseconfig(args, plugins=()):
 
 
 def get_py_project_toml(path):
-    with open(str(path), mode='rb') as file_handler:
+    with open(str(path), mode="rb") as file_handler:
         config_data = toml.load(file_handler)
     return config_data