Bump github.com/docker/docker

Bumps the go_modules group with 1 update in the /backend directory: [github.com/docker/docker](https://github.com/docker/docker).


Updates `github.com/docker/docker` from 28.3.2+incompatible to 28.3.3+incompatible
- [Release notes](https://github.com/docker/docker/releases)
- [Commits](moby/moby@v28.3.2...v28.3.3)

---
updated-dependencies:
- dependency-name: github.com/docker/docker
  dependency-version: 28.3.3+incompatible
  dependency-type: indirect
  dependency-group: go_modules
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backend/go.mod

@@ -42,7 +42,7 @@ require (
 	github.com/cyphar/filepath-securejoin v0.4.1 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/distribution/reference v0.6.0 // indirect
-	github.com/docker/docker v28.3.2+incompatible // indirect
+	github.com/docker/docker v28.3.3+incompatible // indirect
 	github.com/docker/go-connections v0.5.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
 	github.com/emicklei/go-restful/v3 v3.12.2 // indirect