Add state class to qBittorrent UL / DL speed

[owenvoke]

Breaking change

Proposed change

This fixes a bug where the Upload and Download Speed don't have a state class, which results in a repair warning in Home Assistant 2024.10 👍🏻

Type of change

• [ ] Dependency upgrade
• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [ ] New feature (which adds functionality to an existing integration)
• [ ] Deprecation (breaking change to happen in the future)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #124070 and fixes #127971
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [x] The code change is tested and works locally.
• [x] Local tests pass. Your PR cannot be merged unless tests pass
• [x] There is no commented out code in this PR.
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• [x] The code has been formatted using Ruff (ruff format homeassistant tests)
• [ ] Tests have been added to verify that the new code works.

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• [ ] Documentation added/updated for www.home-assistant.io

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• [ ] For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

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• [x] I have reviewed two other open pull requests in this repository.

[home-assistant[bot]]

Hey there @geoffreylagaisse, @finder39, mind taking a look at this pull request as it has been labeled with an integration (qbittorrent) you are listed as a code owner for? Thanks!

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[finder39]

Thanks for fixing this! I started a new job as a few months ago and haven't had time to contribute as much as I'd like to. Great fix :)