Merge pull request #3268 from ruby/dependabot/bundler/gemfiles/truffleruby/test-unit-3.6.4

Bump test-unit from 3.6.2 to 3.6.4 in /gemfiles/truffleruby

Author: eileencodes

gemfiles/truffleruby/Gemfile.lock

@@ -15,7 +15,7 @@ GEM
     rake (13.2.1)
     rake-compiler (1.2.8)
       rake
-    test-unit (3.6.2)
+    test-unit (3.6.4)
       power_assert
 
 PLATFORMS