remove unneeded type attributes on WebsocketNotification

[terencehonles]

Proposed change

This change removes the type attributes on WebsocketNotification which will become errors as of python/mypy#17207

see: https://typing.readthedocs.io/en/latest/spec/enums.html#defining-members:~:text=Members%20defined%20within%20an%20enum%20class%20should%20not%20include%20explicit%20type%20annotations.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
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• 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 #
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[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[home-assistant]

Hey there @mj23000, mind taking a look at this pull request as it has been labeled with an integration (bang_olufsen) you are listed as a code owner for? Thanks!

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[mj23000]

Looks good.

Stale

[frenck]

Thanks, @terencehonles 👍