Update georss_client to 0.4

[exxamalte]

Description:

Update georss_client to version 0.4 which loosens its own third-party dependencies, trying not to interfere with Home Assistant's own dependencies.

Related issue (if applicable): n/a

Pull request in home-assistant.io with documentation (if applicable): n/a

Example entry for configuration.yaml (if applicable): n/a

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.

[fabaff]

You can push updates to the same branch. Add an additional commit then it would be part of #18088.

[exxamalte]

Sure, no problem. I've merged the two PRs now, and will close this one.