chore(deps): update docker/dockerfile docker tag to v1.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/dockerfile	syntax	minor	1.2 -> 1.6

---

Configuration

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

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5804d70) 56.04% compared to head (aa0fd50) 56.04%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #146   +/-   ##
=======================================
  Coverage   56.04%   56.04%           
=======================================
  Files           5        5           
  Lines         248      248           
=======================================
  Hits          139      139           
  Misses        105      105           
  Partials        4        4           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.