build(deps): bump docker in /Containers/mastercontainer

Bumps docker from 28.0.4-cli to 28.1.1-cli.

---
updated-dependencies:
- dependency-name: docker
  dependency-version: 28.1.1-cli
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Containers/mastercontainer/Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:latest
 # Docker CLI is a requirement
-FROM docker:28.0.4-cli AS docker
+FROM docker:28.1.1-cli AS docker
 
 # Caddy is a requirement
 FROM caddy:2.9.1-alpine AS caddy