[Story] Select latest dsp version

[tom-rm-meyer-ISST]

As a puris user,
I want to use the latest dsp version available during catalog requests,
so that I'm compliant with CX-0018 v.4.1.1.

Hints / Details

• See protocol version handling in CX-0018 v.4.1.1
• See endpoint v4alpha/protocol-versions/request (edc 0.10.2 swagger)

Outcome / Acceptance Criteria

Outcome

• ...

Acceptance Criteria

• backend uses v4alpha/protocol-versions/request to determine correct endpoint during catalogging
• backend uses latest supported dsp version during catalogging

Out of Scope

• ...