Bump govuk_test from 2.1.2 to 2.2.0
Bump govuk_test from 2.1.2 to 2.2.0

Bumps [govuk_test](https://github.com/alphagov/govuk_test) from 2.1.2 to 2.2.0.
- [Release notes](https://github.com/alphagov/govuk_test/releases)
- [Changelog](https://github.com/alphagov/govuk_test/blob/master/CHANGELOG.md)
- [Commits](https://github.com/alphagov/govuk_test/compare/v2.1.2...v2.2.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
alphagov/collections,alphagov/collections,alphagov/collections,alphagov/collections