Fix clazy CI job

The build_clazy_clang_tidy CI job on GitLab was still using ci-suse-qt514,
for which we don't maintain dependencies in Jenkins anymore, so it failed
to build, saying it couldn't find any dependencies. Update it to use
ci-suse-qt515.
1 job for !144 with work/clazy-ci-qt515 in 1 minute and 24 seconds (queued for 14 minutes and 40 seconds)
latest merge request