build(deps): bump test-unit from 3.4.6 to 3.4.7 (#822)

Bumps [test-unit](https://github.com/test-unit/test-unit) from 3.4.6 to 3.4.7.
- [Release notes](https://github.com/test-unit/test-unit/releases)
- [Commits](test-unit/test-unit@3.4.6...3.4.7)

---
updated-dependencies:
- dependency-name: test-unit
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -414,7 +414,7 @@ GEM
     strip_attributes (1.11.0)
       activemodel (>= 3.0, < 7.0)
     temple (0.8.2)
-    test-unit (3.4.6)
+    test-unit (3.4.7)
       power_assert
     thor (1.1.0)
     thread_safe (0.3.6)