Release libblkid-rs 0.4.2

[mulkieran]

Milestone: https://github.com/stratis-storage/libblkid-rs/milestone/2
Changelog PR: stratis-storage/libblkid-rs#236
Prior release: stratis-storage/libblkid-rs#230

• Upstream:
• Fedora:
  • rawhide: https://bodhi.fedoraproject.org/updates/FEDORA-2026-1163f3cac0
    • verify stratisd scratch build succeeds in rawhide w/ new version: https://koji.fedoraproject.org/koji/taskinfo?taskID=141945581
  • f43: https://bodhi.fedoraproject.org/updates/FEDORA-2026-7e926135c4
  • f42: https://bodhi.fedoraproject.org/updates/FEDORA-2026-e50cfb097d

[mulkieran]

It seems ready to go. I'll wait a week, in case something else arrives.