Adapt to Conan 2 - Update Julia client

Summary

Upgrading to Conan 2 on the cpplib side required changes to CMakeLists.txt. In particular

• Update Conan to 2.5.0
• ...

Specifications

• Version: cpplib 0.3-dev
• Platform: any

Related MR: caosdb-cpplib!49 (merged)