Bump testcafe from 3.3.0 to 3.4.0

Bumps [testcafe](https://github.com/DevExpress/testcafe) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/DevExpress/testcafe/releases)
- [Changelog](https://github.com/DevExpress/testcafe/blob/master/CHANGELOG.md)
- [Commits](DevExpress/testcafe@v3.3.0...v3.4.0)

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

Signed-off-by: dependabot[bot] <support@github.com>