sysutils/nomad: Update from 0.5.1 to 0.5.2

• client: Fixed a race condition and remove panic when handling duplicate allocations
• client: Cancel wait for remote allocation if migration is no longer required
• client: Failure to stat a single mountpoint does not cause all of host resource usage collection to fail

PR: 215744
Submitted by: jhixson@gmail.com (maintainer)