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

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

tests/requirements.txt

@@ -1,5 +1,5 @@
 alabaster<=0.7.13
-beautifulsoup4>=4.9.1,<4.12.4
+beautifulsoup4<4.12.4,>=4.9.1
 coincidence>=0.2.0
 coverage>=5.1
 coverage-pyver-pragma>=0.2.1