Adjust async_step_usb signature for strict typing

[epenet]

Proposed change

Adjust async_step_usb signature for strict typing, as follow-up to #59503, #59745, #59751, #59761

See home-assistant/architecture#662

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• 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:

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 Black (black --fast 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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  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
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[probot-home-assistant]

Hey there @tkdrob, mind taking a look at this pull request as it has been labeled with an integration (modem_callerid) you are listed as a code owner for? Thanks!
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[probot-home-assistant]

Hey there @bdraco, mind taking a look at this pull request as it has been labeled with an integration (usb) you are listed as a code owner for? Thanks!
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[probot-home-assistant]

Hey there @home-assistant/z-wave, mind taking a look at this pull request as it has been labeled with an integration (zwave_js) you are listed as a code owner for? Thanks!
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[MartinHjelmare]

Looks good!

[bdraco]

LGTM

[epenet]

Thanks