Update test-unit requirement from = 3.4.2 to = 3.4.4 (#2334)

Updates the requirements on [test-unit](https://github.com/test-unit/test-unit) to permit the latest version.
- [Release notes](https://github.com/test-unit/test-unit/releases)
- [Commits](test-unit/test-unit@3.4.2...3.4.4)

---
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

@@ -44,7 +44,7 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    test-unit (3.4.2)
+    test-unit (3.4.4)
       power_assert
     timecop (0.9.4)
     unicode-display_width (2.0.0)
@@ -60,7 +60,7 @@ DEPENDENCIES
   rake (= 13.0.3)
   rubocop (= 1.16.0)
   simplecov (= 0.17.1, < 0.18)
-  test-unit (= 3.4.2)
+  test-unit (= 3.4.4)
   timecop (= 0.9.4)
   yard (= 0.9.26)
 

faker.gemspec

@@ -37,7 +37,7 @@ Gem::Specification.new do |spec|
   # Stop upgrading SimpleCov until the following issue will be resolved.
   # https://github.com/codeclimate/test-reporter/issues/418
   spec.add_development_dependency('simplecov', '0.17.1', '< 0.18')
-  spec.add_development_dependency('test-unit', '3.4.2')
+  spec.add_development_dependency('test-unit', '3.4.4')
   spec.add_development_dependency('timecop', '0.9.4')
   spec.add_development_dependency('yard', '0.9.26')
 end