[renovate] Update ghcr.io/devcontainers/features/docker-in-docker Docker tag to v2.12

See merge request !210

Co-authored-by: Renovate Bot <renovate@danet.fbi.h-da.de>

.devcontainer/devcontainer.json

@@ -12,7 +12,7 @@
             "ghcr.io/devcontainers/features/go:1": {
                     "version": "1.22"
                 },
-            "ghcr.io/devcontainers/features/docker-in-docker:2.11": {
+            "ghcr.io/devcontainers/features/docker-in-docker:2.12": {
                 "version": "latest",
                 "dockerDashComposeVersion": "v2"
                 }