Don't create connections between sensors. Fixes #22787

[StevenLooman]

Description:

Don't create connections between sensors for upnp-platform. Fixes sensors being unavailable after a restart.

Related issue (if applicable): fixes #22787

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#<home-assistant.io PR number goes here>

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

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

• The manifest file has all fields filled out correctly (example).
• New dependencies have been added to requirements in the manifest (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.
• New files were added to .coveragerc.

[github-actions]

Hey there @robbiet480, mind taking a look at this pull request as its been labeled with a integration (upnp) you are listed as a codeowner for? Thanks!