Release devicemapper-rs 0.34.6

[mulkieran]

Milestone: https://github.com/stratis-storage/devicemapper-rs/milestone/6
Changelog PR: https://github.com/stratis-storage/devicemapper-rs/pull/790/files
Prior release: (July 22) https://github.com/stratis-storage/devicemapper-rs/releases/tag/devicemapper-v0.34.5

• Upstream:
• Fedora:
  • rawhide:
    • verify stratisd scratch build succeeds in rawhide w/ new version:
  • f43:
  • f42:
  • f41: