Update ghcr.io/devcontainers/features/docker-in-docker Docker tag to v3 (#1797)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.devcontainer/devcontainer.json

@@ -20,7 +20,7 @@
   ],
   "runArgs": [],
   "features": {
-    "ghcr.io/devcontainers/features/docker-in-docker:2": {}
+    "ghcr.io/devcontainers/features/docker-in-docker:3": {}
   },
   "customizations": {
     "vscode": {