v3.9.0rc1

🤖 I have created a release beep boop

3.9.0rc1 (2023-12-08)

Features

• Add support for Python 3.12 (#813) (6591b53)
• Use native namespaces instead of pkg_resources (#812) (10ad75d)

Bug Fixes

• Fixed DeprecationWarning for datetime objects for Python 3.12 (#824) (2384981)
• Fixed object paths in autogenerated code in owlbot.py (#804) (b14bb14)
• Updated protobuf JSON formatting to support nested protobufs (#797) (a00c261)
• Use retry_async instead of retry in async client (#816) (c79f7f5)
• Use warning instead of warn in system tests to avoid DeprecationWarning (#821) (c447175)

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