build(deps): bump org.grails:grails-web-testing-support (#30)

Bumps [org.grails:grails-web-testing-support](https://github.com/grails/grails-testing-support) from 3.1.2 to 3.2.0.
- [Release notes](https://github.com/grails/grails-testing-support/releases)
- [Commits](grails/grails-testing-support@v3.1.2...v3.2.0)

---
updated-dependencies:
- dependency-name: org.grails:grails-web-testing-support
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>