Use double splat for Ruby >= 3.0

[patrickarnett]

Overview

Kafka::Consumer#each_message takes keyword arguments. In Ruby >= 3.0, prepending it with a method that takes only positional arguments causes an ArgumentError when calling super.

Reviewer Checklist

• Perform code review
• Add performance label
• Perform appropriate level of performance testing
• Confirm all checks passed
• Add version label prior to acceptance

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[tannalynn]

Thank you for making this update!
We did something similar for our rdkafka instrumentation but this one slid under the radar and I didn't realize this would happen. We appreciate the contribution!