Bump jsdom from 16.4.0 to 16.7.0 in /packages/themes (#333)

Bumps [jsdom](https://github.com/jsdom/jsdom) from 16.4.0 to 16.7.0.
- [Release notes](https://github.com/jsdom/jsdom/releases)
- [Changelog](https://github.com/jsdom/jsdom/blob/master/Changelog.md)
- [Commits](jsdom/jsdom@16.4.0...16.7.0)

---
updated-dependencies:
- dependency-name: jsdom
  dependency-type: indirect
...

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