Bump serialize-javascript from 6.0.0 to 6.0.2 in /webpack-plugin (#5247)

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

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-version: 6.0.2
  dependency-type: indirect
...

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