Bump serialize-javascript and mocha in /packages/stitch

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


Updates `serialize-javascript` from 6.0.0 to 6.0.2
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](yahoo/serialize-javascript@v6.0.0...v6.0.2)

Updates `mocha` from 9.2.2 to 11.7.4
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/main/CHANGELOG.md)
- [Commits](mochajs/mocha@v9.2.2...v11.7.4)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-version: 6.0.2
  dependency-type: indirect
- dependency-name: mocha
  dependency-version: 11.7.4
  dependency-type: direct:development
...

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

Author: dependabot[bot]