Update docker.io/ajbura/cinny Docker tag to v4.2.1

This MR contains the following updates:

Package	Type	Update	Change
docker.io/ajbura/cinny	stage	patch	v4.2.0 -> v4.2.1

---

Release Notes

cinnyapp/cinny (docker.io/ajbura/cinny)

v4.2.1

Compare Source

What's Changed

• Fix auth media check for dendrite by @​kfiven in https://github.com/cinnyapp/cinny/pull/1952

Full Changelog: https://github.com/cinnyapp/cinny/compare/v4.2.0...v4.2.1

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever MR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

---

This MR has been generated by Renovate Bot. The local configuration can be found in the local Renovate Bot repository.