Bump test-unit from 3.5.8 to 3.5.9

Bumps [test-unit](https://github.com/test-unit/test-unit) from 3.5.8 to 3.5.9.
- [Release notes](https://github.com/test-unit/test-unit/releases)
- [Commits](test-unit/test-unit@3.5.8...3.5.9)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
     rouge (4.1.1)
     syntax_tree (6.1.1)
       prettier_print (>= 1.2.0)
-    test-unit (3.5.8)
+    test-unit (3.5.9)
       power_assert
 
 PLATFORMS