chore(deps): update rdkafka requirement from 0.38 to 0.39

[dependabot]

Updates the requirements on rdkafka to permit the latest version.

Changelog

Sourced from rdkafka's changelog.

0.39.0 (2026-01-25)

• Fix the char zero ending in native config (#706).
• Implement FromIterator for TopicPartitionList (#795).
• Sanitize ClientConfig and AdminClient debugging (#796).
• Handle null characters in topic in BaseProducer::send (#782).
• Bump rdkafka-sys.

#706: fede1024/rust-rdkafka#706 #795: fede1024/rust-rdkafka#795 #796: fede1024/rust-rdkafka#796 #782: fede1024/rust-rdkafka#782

0.38.0 (2025-07-05)

• Update BaseProducer::poll to not return early, and instead continue looping until the passed timeout is reached.
• Breaking change. Change signature for OwnedDeliveryResult. The Ok variant is now a Delivery struct, rather than a tuple. This allows or including Timestamp as a result field. It means that adding values in the future will not require a breaking change.
• Update BaseProducer::flush to correctly call poll internally, until all messages have been processed.
• Upgrade all library dependencies.
• Add tests for Kafka versions up to 0.38.0.
• Require a minimum of CMake 3.5 compatibility for CMake build (#766)

#766: fede1024/rust-rdkafka#766

0.37.0 (2024-11-25)

• Update MSRV to 1.70
• Fix test dependency on docker compose.
• Address wakeup races introduced by pivoting to the event API.
• Remove testing for old Kafka versions (before 3.0). Add tests for 3.7.

0.36.2 (2024-01-16)

• Update BaseConsumer::poll to return None when handling rebalance or offset commit events.

0.36.0 (2023-11-08)

• Pivot the library from using librdkafka's callback interface to using the event interface. The public API of the crate does not change.

0.35.0 (2023-11-07)

• Update bundled librdkafka to 2.3.0.
• Add cargo enforcement of MSRV of 1.61.

... (truncated)

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