Bump testcafe from 1.18.6 to 1.19.0 (#476)

Bumps [testcafe](https://github.com/DevExpress/testcafe) from 1.18.6 to 1.19.0.
- [Release notes](https://github.com/DevExpress/testcafe/releases)
- [Changelog](https://github.com/DevExpress/testcafe/blob/master/CHANGELOG.md)
- [Commits](DevExpress/testcafe@v1.18.6...v1.19.0)

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

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