v3.9.0

What's Changed

• Bump C++ client to 3.8.0 by @BewareMyPower in #270
• Bump C++ client to 4.0.0 by @BewareMyPower in #273
• Support Python 3.14 and remove Python 3.9 support by @BewareMyPower in #274
• Support Message.producer_name() by @BewareMyPower in #275
• Support encryption context on Message by @BewareMyPower in #276
• Implement async consumer by @BewareMyPower in #277
• Improve asynchronous producer with more options for creation and send by @BewareMyPower in #280

Full Changelog: v3.8.0...v3.9.0