Clean up testing with optimagic after releases #20
Description
Testing with optimagic is currently only possible locally with a local tranquilo and local optimagic version. After tranquilo 0.1.0 and optimagic 0.5.3 has been published, adjust the tests such that tranquilo's test suite contains optimagic.
- Use optimagic consistently in the development and testing env of tranquilo
- Check whether we can close Make sure that deprecation warnings are handled #15