chore(deps-dev): Bump behat/behat from 3.19.0 to 3.21.1 in /tests

Bumps [behat/behat](https://github.com/Behat/Behat) from 3.19.0 to 3.21.1.
- [Release notes](https://github.com/Behat/Behat/releases)
- [Changelog](https://github.com/Behat/Behat/blob/master/CHANGELOG.md)
- [Commits](Behat/Behat@v3.19.0...v3.21.1)

---
updated-dependencies:
- dependency-name: behat/behat
  dependency-version: 3.21.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]