Mark new gate device class as 2FA

[balloob]

Breaking change

Proposed change

Mark the new "gate" cover device class as requiring 2FA for Google.

(FYI @bdraco)

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

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# Example configuration.yaml

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• This PR fixes or closes issue: fixes #
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[probot-home-assistant]

Hey there @home-assistant/cloud, mind taking a look at this pull request as its been labeled with a integration (google_assistant) you are listed as a codeowner for? Thanks!

[springstan]

Failing CI is unrelated to this change, therefore I think we can merge this.