chore(deps-dev): bump orchestra/testbench in the dev-dependencies group

Bumps the dev-dependencies group with 1 update: [orchestra/testbench](https://github.com/orchestral/testbench).


Updates `orchestra/testbench` from 8.30.0 to 8.31.0
- [Release notes](https://github.com/orchestral/testbench/releases)
- [Changelog](https://github.com/orchestral/testbench/blob/9.x/CHANGELOG-8.x.md)
- [Commits](orchestral/testbench@v8.30.0...v8.31.0)

---
updated-dependencies:
- dependency-name: orchestra/testbench
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>