Bump serialize-javascript and codeceptjs in /codeceptjs-example

Bumps [serialize-javascript](https://github.com/yahoo/serialize-javascript) to 6.0.2 and updates ancestor dependency [codeceptjs](https://github.com/Codeception/codeceptjs). These dependencies need to be updated together.


Updates `serialize-javascript` from 4.0.0 to 6.0.2
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](yahoo/serialize-javascript@v4.0.0...v6.0.2)

Updates `codeceptjs` from 3.1.3 to 3.7.1
- [Release notes](https://github.com/Codeception/codeceptjs/releases)
- [Changelog](https://github.com/codeceptjs/CodeceptJS/blob/3.x/CHANGELOG.md)
- [Commits](https://github.com/Codeception/codeceptjs/commits)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-type: indirect
- dependency-name: codeceptjs
  dependency-type: direct:development
...

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

Author: dependabot[bot]