Merge branch 'update-unf_ext-0.0.7.4' into 'master'

Update unf_ext from 0.0.7.2 to 0.0.7.4 (#38368)

Closes #38368

See merge request gitlab-org/gitlab-ce!14601

Gemfile.lock

@@ -910,7 +910,7 @@ GEM
       json (>= 1.8.0)
     unf (0.1.4)
       unf_ext
-    unf_ext (0.0.7.2)
+    unf_ext (0.0.7.4)
     unicode-display_width (1.3.0)
     unicorn (5.1.0)
       kgio (~> 2.6)