Update bundled_gems

gems/bundled_gems

@@ -2,7 +2,7 @@
 minitest 5.14.4 https://github.com/seattlerb/minitest
 power_assert 2.0.0 https://github.com/ruby/power_assert
 rake 13.0.3 https://github.com/ruby/rake
-test-unit 3.4.0 https://github.com/test-unit/test-unit 3.4.0
+test-unit 3.4.1 https://github.com/test-unit/test-unit 3.4.1
 rexml 3.2.5 https://github.com/ruby/rexml
 rss 0.2.9 https://github.com/ruby/rss 0.2.9
 typeprof 0.13.0 https://github.com/ruby/typeprof