Fix `main` pipeline

Summary

Pipelines on main fail in unit-test stage due to a missing conan version (see, e.g., https://gitlab.indiscale.com/caosdb/src/caosdb-octavelib/-/jobs/122360).

Expected Behavior

Should run.

Actual Behavior

Don't

Steps to Reproduce the Problem

Trigger a pipeline on main.

Specifications

• Version: 0.1.2
• Platform: Pipeline

Possible fixes

dev pipelines run fine, so maybe a release will do the trick?