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

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/devcontainers/features/docker-in-docker	feature	minor	2.11 -> 2.12

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.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"
                 }