Merge pull request #3332 from ruby/dependabot/bundler/gemfiles/typecheck/test-unit-3.6.7

Bump test-unit from 3.6.4 to 3.6.7 in /gemfiles/typecheck

Author: kddnewton

gemfiles/typecheck/Gemfile.lock

@@ -100,7 +100,7 @@ GEM
       yard-sorbet
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
-    test-unit (3.6.4)
+    test-unit (3.6.7)
       power_assert
     thor (1.3.2)
     tzinfo (2.0.6)