Update Rust crate rdkafka to 0.39.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rdkafka	dependencies	minor	0.37.0 → 0.39.0

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Release Notes

fede1024/rust-rdkafka (rdkafka)

v0.39.0

• 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.

v0.38.0

• 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)

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
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The artifact failure details are included below:

File name: rdkafka-sys/third_party/Cargo.lock

Command failed: cargo update --config net.git-fetch-with-cli=true --manifest-path rdkafka-sys/third_party/Cargo.toml --workspace
    Updating crates.io index
error: failed to select a version for `rdkafka-sys`.
    ... required by package `rdkafka v0.39.0`
    ... which satisfies dependency `rdkafka = "^0.39.0"` of package `third_party v0.0.0 (/tmp/renovate/repos/github/scasagrande/bazel-examples/rdkafka-sys/third_party)`
versions that meet the requirements `^4.10.0` are: 4.10.0+2.12.1

all possible versions conflict with previously selected packages

  previously selected package `rdkafka-sys v4.9.0+2.10.0`
    ... which satisfies dependency `rdkafka-sys = "=4.9.0"` of package `third_party v0.0.0 (/tmp/renovate/repos/github/scasagrande/bazel-examples/rdkafka-sys/third_party)`

failed to select a version for `rdkafka-sys` which could resolve this conflict