chore(deps): update ghcr.io/devcontainers/features/docker-in-docker docker tag to v4 (#265)

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

Author: renovate[bot]

.devcontainer/devcontainer.json

@@ -56,7 +56,7 @@
 	"postCreateCommand": "bash .devcontainer/mssql/postCreateCommand.sh 'P@ssw0rd' './bin/Debug/' './.devcontainer/mssql/'",
 	"features": {
 		"ghcr.io/devcontainers/features/node:2": {},
-		"ghcr.io/devcontainers/features/docker-in-docker:3": {}
+		"ghcr.io/devcontainers/features/docker-in-docker:4": {}
 	}
 
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.