Bump serialize-javascript and plotly.js

Removes [serialize-javascript](https://github.com/yahoo/serialize-javascript). It's no longer used after updating ancestor dependency [plotly.js](https://github.com/plotly/plotly.js). These dependencies need to be updated together.


Removes `serialize-javascript`

Updates `plotly.js` from 2.35.3 to 3.4.0
- [Release notes](https://github.com/plotly/plotly.js/releases)
- [Changelog](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md)
- [Commits](plotly/plotly.js@v2.35.3...v3.4.0)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-version: 
  dependency-type: indirect
- dependency-name: plotly.js
  dependency-version: 3.4.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]