Bump test-unit from 3.5.7 to 3.6.1

Bumps [test-unit](https://github.com/test-unit/test-unit) from 3.5.7 to 3.6.1.
- [Release notes](https://github.com/test-unit/test-unit/releases)
- [Commits](test-unit/test-unit@3.5.7...3.6.1)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -61,7 +61,7 @@ GEM
     parallel (1.22.1)
     parser (3.2.0.0)
       ast (~> 2.4.1)
-    power_assert (2.0.2)
+    power_assert (2.0.3)
     prettier_print (1.2.1)
     pry (0.14.2)
       coderay (~> 1.1)
@@ -105,7 +105,7 @@ GEM
     stringio (3.0.5)
     syntax_tree (6.1.1)
       prettier_print (>= 1.2.0)
-    test-unit (3.5.7)
+    test-unit (3.6.1)
       power_assert
     thor (1.2.1)
     thread_safe (0.3.6)