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

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

requirements.txt

@@ -4,7 +4,7 @@ attrs>=20.3.0
 click>=7.1.2
 consolekit>=0.9.0
 domdf-python-tools>=2.4.0
-isort>=5.5.2,<5.7.1
+isort<5.7.1,>=5.5.2
 toml>=0.10.2
 typing-extensions>=3.7.4.3
 yapf==0.30.0