build(deps): bump node in /examples/shared/node

Bumps node from 20.5-bullseye-slim to 21.0-bullseye-slim.

---
updated-dependencies:
- dependency-name: node
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/shared/node/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20.5-bullseye-slim@sha256:f54a16be368537403c6f20e6e9cfa400f4b71c71ae9e1e93558b33a08f109db6 as node-base
+FROM node:21.0-bullseye-slim@sha256:0b45d811c7eb924e9e5c57e4cf609af27ab48d2a3db2b5fad7f5e1cd8963d720 as node-base
 
 
 FROM node-base as node-http-auth