Upstream dependency got updated - Alpine with tag 3.20

[ember-nexus-bot]

Open tasks:

• [x] Check if Dockerfile compiles with the newest Alpine version.
• If there are updates:
  • [x] Update local Dockerfile.
  • [x] Add changelog entry.
  • [ ] Release new patch release.
• See also:
  • Alpine release branches.
  • Alpine news archive.
  • Alpine on Docker Hub.
  • Alpine branches on GitHub.