Fix check_libxrpl CI flow

[godexsoft]

Issue Description

XRPLF/rippled#5028 uses Conan channels in order to store libxrpl packages that need to be verified by check_libxrpl flow. Everything goes well until we try to upload the artifact of clio_tests with a name containing a forward slash. See https://github.com/godexsoft/clio/actions/runs/10270363766/job/28417911420 for example.

Steps to Reproduce

Notify check_libxrpl of a new package with channel syntax (xrpl/version@clio/pr_num) to test.

Expected Result

Workflow should be able to upload and download the artifact.

Actual Result

Artifact upload fails due to forward slash.