Merge pull request #237 from ruby-syntax-tree/dependabot/bundler/test-unit-3.6.6

Bump test-unit from 3.6.5 to 3.6.6

Author: github-actions[bot]

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
     rouge (4.5.1)
     syntax_tree (6.2.0)
       prettier_print (>= 1.2.0)
-    test-unit (3.6.5)
+    test-unit (3.6.6)
       power_assert
 
 PLATFORMS