Bump canvas from 2.8.0 to 2.9.0 (#2048)

Bumps [canvas](https://github.com/Automattic/node-canvas) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/Automattic/node-canvas/releases)
- [Changelog](https://github.com/Automattic/node-canvas/blob/master/CHANGELOG.md)
- [Commits](Automattic/node-canvas@v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: canvas
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

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