Update confluent-kafka-client.version from v6.2.15 to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.confluent:kafka-avro-serializer (source)	6.2.15 → 8.2.1
io.confluent:kafka-schema-registry-client (source)	6.2.15 → 8.2.1

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Release Notes

confluentinc/schema-registry (io.confluent:kafka-avro-serializer)

v7.9.7

v7.9.6

v7.9.4

v7.9.3

v7.9.2

v7.9.1

v7.9.0

v7.8.8

v7.8.7

v7.8.6

v7.8.5

v7.8.4

v7.8.3

v7.8.2

v7.8.1

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• critical: 0
• high: 2
• medium: 6
• low: 3

Docker Scan Report can be found here

Allowlist

Use the allowlist if you want to ignore vulnerabilities that do not affect the repository.
See the Docker Scan documentation on how to use allowlist.