Maintenance: add new `kafka` scope to semantic config

[dreamorosi]

Summary

As part of #4057 we're adding a new utility to work with Kafka, and because of this we need a new valid scope under .github/semantic.yml.

Why is this needed?

So that we can validate PR titles.

Which area does this relate to?

No response

Solution

No response

Acknowledgment

• This request meets Powertools for AWS Lambda (TypeScript) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Python, Java, and .NET

Future readers

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[powertools-for-aws-oss-automation]

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[github-actions]

This is now released under v2.22.0 version!