Dropped 3.6 support for azure-communication-identity

[Aigerim (AikoBB)]

Description

Dropped 3.6 support for azure-communication-identity

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

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All SDK Contribution checklist:

• 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.

[Azure SDK Bot (azure-sdk)]

API change check

APIView has identified API level changes in this PR and created following API reviews.

azure-communication-identity