build(poetry): relax charset-normalizer dependency to allow 3.0.x

Author: jakob-keller

pyproject.toml

@@ -70,7 +70,7 @@ jinja2 = ">=2.10.3"
 pyyaml = ">=3.08"
 argcomplete = ">=1.12.1,<2.1"
 typing-extensions = "^4.0.1"
-charset-normalizer = "^2.1.0"
+charset-normalizer = ">=2.1.0,<3.1"
 
 [tool.poetry.dev-dependencies]
 ipython = "^7.2"