Update dependency Confluent.Kafka to 1.9.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Confluent.Kafka	1.8.2 → 1.9.3

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Release Notes

confluentinc/confluent-kafka-dotnet (Confluent.Kafka)

v1.9.3: 1.9.3

Enhancements

• Added NormalizeSchemas configuration property to the Avro, Json and Protobuf serdes.

Fixes

• Schema Registry authentication now works with passwords that contain the ':' character (luismedel).
• Added missing librdkafka internal and broker error codes to the ErrorCode enum.

v1.9.2: 1.9.2

Enhancements

• References librdkafka.redist 1.9.2 which includes an Apple M1 librdkafka build.
• Added ACL AdminClient operations (CreateAcls, DescribeAcls, DeleteAcls) (emasab).
• Added DeleteGroups to AdminClient (3schwartz).
• Enhanced the Avro Specific Deserializer to ignore the type namespace (sergemat).
• Improved efficiency of the statistics handler (VladimirTyrin).

Fixes

• The AdminClient poll loop no longer terminates when a request results in an error (emasab).
• Upgraded Newtonsoft.Json to 13.0.1 to address a security vulnerability in 9.0.1.

v1.9.0

Enhancements

• References librdkafka.redist 1.9.0. Refer to the librdkafka release notes
  for a complete list of changes, enhancements, fixes and upgrade considerations.
• References Apache.Avro 1.11.0. Refer to the release notes for further information (JanReimerD).
• Added support for serializing and deserializing null in Avro serdes (YairHalberstadt).
• Enhanced CachedSchemaRegistryClient to allow for user-implemented authentication schemes (henrydaly).
• Reduced memory use when producing with delivery reports disabled (TrickyCat).

Fixes

• Resolved incompatibility with Apple M1 processors (dkaukov).
• No longer crashes on Alpine Linux when MUSL is installed (shurivich).
• JSON validation exception messages now properly include failing paths (drinehimer).
• Upgraded Google.Protobuf dependency to 3.15.0 (CVE-2021-22570).
• Resolved memory leak in AdminClient response handler (emasab).
• Resolved memory leak in Producer.SendOffsetsToTransaction.

Upgrade Considerations

• The earliest supported .NET Framework version is now 4.6.2, previously this was 4.5 (bjornbouetsmith).

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