Bump canvas from 2.6.0 to 2.6.1
Bump canvas from 2.6.0 to 2.6.1

Bumps [canvas](https://github.com/Automattic/node-canvas) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/Automattic/node-canvas/releases)
- [Changelog](https://github.com/Automattic/node-canvas/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Automattic/node-canvas/compare/v2.6.0...v2.6.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
bostrom/text-to-image,bostrom/text-to-image,bostrom/text-to-image