Bump typing-extensions dependency to >= 4.6.0 to fix import name issue in azure-servicebus

[YaroBear]

Description

Fixes "ImportError: cannot import name 'Buffer' from 'typing_extensions'" as described in this issue #34868

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

Thank you for your contribution @YaroBear! We will review the pull request and get back to you soon.

[YaroBear]

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[swathipil]

/azp run python - servicebus - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[swathipil]

Hi @YaroBear - Thanks for your contribution!! We'll merge this after tests pass!

[kashifkhan]

/check-enforcer override