Bump cookie, express and express-session in /example (#41)

Bumps [cookie](https://github.com/jshttp/cookie) to 0.7.1 and updates ancestor dependencies [cookie](https://github.com/jshttp/cookie), [express](https://github.com/expressjs/express) and [express-session](https://github.com/expressjs/session). These dependencies need to be updated together.


Updates `cookie` from 0.4.1 to 0.7.1
- [Release notes](https://github.com/jshttp/cookie/releases)
- [Commits](jshttp/cookie@v0.4.1...v0.7.1)

Updates `express` from 4.21.0 to 4.21.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.1/History.md)
- [Commits](expressjs/express@4.21.0...4.21.1)

Updates `express-session` from 1.17.2 to 1.18.1
- [Release notes](https://github.com/expressjs/session/releases)
- [Changelog](https://github.com/expressjs/session/blob/master/HISTORY.md)
- [Commits](expressjs/session@v1.17.2...v1.18.1)

---
updated-dependencies:
- dependency-name: cookie
  dependency-type: indirect
- dependency-name: express
  dependency-type: direct:production
- dependency-name: express-session
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

example/package.json

@@ -12,8 +12,8 @@
   "dependencies": {
     "body-parser": "^1.20.1",
     "@duosecurity/duo_universal": "^2.0.2",
-    "express": "^4.21.0",
-    "express-session": "^1.17.2",
+    "express": "^4.21.1",
+    "express-session": "^1.18.1",
     "nunjucks": "^3.2.4"
   }
 }