Merge pull request #1 from ruby-syntax-tree/dependabot/bundler/test-unit-3.5.5

Bump test-unit from 3.5.3 to 3.5.5

Author: github-actions[bot]

Gemfile.lock

@@ -8,7 +8,7 @@ GEM
   specs:
     power_assert (2.0.1)
     rake (13.0.6)
-    test-unit (3.5.3)
+    test-unit (3.5.5)
       power_assert
 
 PLATFORMS