Bump aiohttp to 3.9.4

[bdraco]

Proposed change

This PR is rc0 for now but will be updated when the full release it out. For now its to get a CI run to see if there are any side effects/regressions and make sure https://github.com/aio-libs/aiohttp/pull/8089 is good with our code.

Type of change

• [x] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (which adds functionality to the supervisor)
• [ ] 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 #
• This PR is related to issue:
• Link to documentation pull request:
• Link to cli pull request:

Checklist

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

If API endpoints of add-on configuration are added/changed:

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