Bump test-unit from 3.6.2 to 3.6.3 (#405)

Bumps [test-unit](https://github.com/test-unit/test-unit) from 3.6.2 to 3.6.3.
- [Release notes](https://github.com/test-unit/test-unit/releases)
- [Commits](test-unit/test-unit@3.6.2...3.6.3)

---
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>

Gemfile.lock

@@ -271,7 +271,7 @@ GEM
       faraday-follow_redirects
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
-    test-unit (3.6.2)
+    test-unit (3.6.3)
       power_assert
     timeout (0.4.2)
     tzinfo (2.0.6)