PR Checklist

• This comment contains a description of changes (with reason)
• Referenced issue is linked
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated
• waiting for new release of koina-py including the required race-condition fix

Description of changes

• switched out old Koina class with the one the is now implemented in the new koina-py client
• added the already implemented fix for the race condition on retries in the new Koina class in koina-py

Technical details

• import new koina-py client and extend the Koina class to add features required by Oktoberfest.