chore(deps): update node.js to v21 (#5)

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM ghcr.io/hazmi35/node:20-dev-alpine as build-stage
+FROM ghcr.io/hazmi35/node:21-dev-alpine as build-stage
 
 # Prepare pnpm with corepack (experimental feature)
 RUN corepack enable && corepack prepare pnpm@latest
@@ -22,7 +22,7 @@ RUN pnpm run build
 RUN pnpm prune --production
 
 # Get ready for production
-FROM ghcr.io/hazmi35/node:20-alpine
+FROM ghcr.io/hazmi35/node:21-alpine
 
 LABEL name "template"
 LABEL maintainer "Clytage <admin@clytage.org>"