Bump tar and canvas

Removes [tar](https://github.com/isaacs/node-tar). It's no longer used after updating ancestor dependency [canvas](https://github.com/Automattic/node-canvas). These dependencies need to be updated together.


Removes `tar`

Updates `canvas` from 2.11.2 to 3.2.1
- [Release notes](https://github.com/Automattic/node-canvas/releases)
- [Changelog](https://github.com/Automattic/node-canvas/blob/master/CHANGELOG.md)
- [Commits](Automattic/node-canvas@v2.11.2...v3.2.1)

---
updated-dependencies:
- dependency-name: tar
  dependency-version: 
  dependency-type: indirect
- dependency-name: canvas
  dependency-version: 3.2.1
  dependency-type: direct:production
...

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