chore(deps): bump serialize-javascript and copy-webpack-plugin (#14594)

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


Updates `serialize-javascript` from 5.0.1 to 6.0.2
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](yahoo/serialize-javascript@v5.0.1...v6.0.2)

Updates `copy-webpack-plugin` from 6.4.1 to 12.0.2
- [Release notes](https://github.com/webpack-contrib/copy-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/copy-webpack-plugin@v6.4.1...v12.0.2)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-type: indirect
- dependency-name: copy-webpack-plugin
  dependency-type: direct:development
...

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

Author: dependabot[bot]