Bump express in the npm_and_yarn group across 1 directory

Bumps the npm_and_yarn group with 1 update in the / directory: [express](https://github.com/expressjs/express).


Updates `express` from 5.1.0 to 5.2.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@v5.1.0...v5.2.1)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 5.2.1
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/simple-host/package.json

@@ -24,7 +24,7 @@
     "bun": "^1.3.2",
     "concurrently": "^9.2.1",
     "cors": "^2.8.5",
-    "express": "^5.1.0",
+    "express": "^5.2.1",
     "prettier": "^3.6.2",
     "vite": "^6.0.0",
     "vite-plugin-singlefile": "^2.3.0",

examples/simple-server/package.json

@@ -23,7 +23,7 @@
     "@vitejs/plugin-react": "^4.3.4",
     "concurrently": "^9.2.1",
     "cors": "^2.8.5",
-    "express": "^5.1.0",
+    "express": "^5.2.1",
     "typescript": "^5.7.2",
     "vite": "^6.0.0",
     "vite-plugin-singlefile": "^2.3.0"