ci: Update to ROCm 6 HIP on Fedora 41 The problem that motivated commit 3a44b8dfc0 (ci: Move job for HIP tests on Fedora 39 to a dedicated base image, 2024-04-24, v3.30.0-rc1~202^2~11) turns out to be exposed by spaces in the path to HIP binaries. Move the CI work directory to a path without spaces. Closes: #25932