Upgrade vulnerable Kafka client third-party from v2.5.0.

The third-party Kafka client library kafka-clients.jar was upgraded from 2.5.0 to 2.8.1 to resolve CVE-2021-38153. Connecting to Kafka brokers older than 2.8.1 is no longer supported.

Fix a potential exploit in the HTTPClient logging.

A security issue involving a malformed content-encoding header in the HTTP client transport has been resolved.