Replace bitnami Kafka image with soldevelo/kafka

[igor-soldev]

This change updates the Docker image used for Kafka in the Makefile from bitnami/kafka to soldevelo/kafka.
Soldevelo image is a drop-in replacement that remains fully compatible with Bitnami’s configuration and environment variables.

The Bitnami Kafka image is now behind a paywall and no longer publicly available, which prevents CI/CD and local environments from functioning properly.
Switching to Soldevelo’s maintained image ensures:

• continued compatibility with existing Kafka setup,
• availability of regular updates and security patches,
• use of an image from a trusted and open source provider.