build(deps): bump koa from 3.0.0 to 3.2.1 in /examples

Bumps [koa](https://github.com/koajs/koa) from 3.0.0 to 3.2.1.
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](koajs/koa@v3.0.0...v3.2.1)

---
updated-dependencies:
- dependency-name: koa
  dependency-version: 3.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

examples/package.json

@@ -21,7 +21,7 @@
     "@erest/koa": "workspace:*",
     "@erest/leizmweb": "workspace:*",
     "express": "^5.1.0",
-    "koa": "^3.0.0",
+    "koa": "^3.2.1",
     "koa-bodyparser": "^4.4.1",
     "koa-router": "^13.1.0",
     "zod": "^4.0.0"