Fix: ssl_context argument to Kafka consumer wrapper

[glotars]

Description

Fix for bug with ssl_context not being passed via propan.fastapi.KafkaRouter to aiokafka.AIOKafkaConsumer

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project (scripts/lint.sh has no errors)
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I added a code examples to illustrate the changes