chore(deps): update mcr.microsoft.com/devcontainers/javascript-node docker digest to 21f15d3 in dockerfile#426

fzipi merged 2 commits intomaincoreruleset/website:mainfrom

renovate/mcr.microsoft.com-devcontainers-javascript-nodecoreruleset/website:renovate/mcr.microsoft.com-devcontainers-javascript-nodeCopy head branch name to clipboard