Bump serialize-javascript and mocha in /javascript

Bumps [serialize-javascript](https://github.com/yahoo/serialize-javascript) to 7.1.1 and updates ancestor dependency [mocha](https://github.com/mochajs/mocha). These dependencies need to be updated together.


Updates `serialize-javascript` from 6.0.2 to 7.1.1
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](https://github.com/yahoo/serialize-javascript/compare/v6.0.2...v7.1.1)

Updates `mocha` from 10.8.2 to 12.0.0
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/main/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v10.8.2...v12.0.0)

---
updated-dependencies:
- dependency-name: mocha
  dependency-version: 12.0.0
  dependency-type: direct:development
- dependency-name: serialize-javascript
  dependency-version: 7.1.1
  dependency-type: indirect
...

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

javascript/package.json

@@ -42,7 +42,7 @@
     "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-prettier": "^5.1.3",
     "globals": "^15.8.0",
-    "mocha": "~10.8",
+    "mocha": "~12.0",
     "prettier": "^3.3.2",
     "prettier-eslint": "~15.0",
     "sinon": "^18.0.0"