Allow use with earlier Python versions

Right now, the pyproject.toml disallows using this package with Python versions that are earlier than 3.11:

[tool.poetry.dependencies]
python = "^3.11"

I would like to use these stubs, but the project that I'm using confluent-kafka in is still using Python 3.10. Since confluent-kafka does not limit which version of Python 3 is ok to use, could the version restraint be relaxed here as well?