chore(deps): update ghcr.io/devcontainers/features/docker-in-docker docker tag to v3 (#68)

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

Author: renovate[bot]

.devcontainer.json

@@ -7,7 +7,7 @@
   },
   "features": {
     "ghcr.io/devcontainers/features/java:1": {},
-    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/docker-in-docker:3": {},
     "ghcr.io/devcontainers/features/common-utils:2": {},
     "ghcr.io/mikaello/devcontainer-features/kotlinc:latest": {},
     "ghcr.io/mikaello/devcontainer-features/modern-shell-utils:latest": {}