Merge pull request #1898 from ruby/dependabot/bundler/public_suffix-5.1.1

Bump public_suffix from 5.1.0 to 5.1.1

Author: soutaro

Gemfile.lock

@@ -70,7 +70,7 @@ GEM
     power_assert (2.0.3)
     psych (4.0.6)
       stringio
-    public_suffix (5.1.0)
+    public_suffix (5.1.1)
     raap (0.8.0)
       rbs (~> 3.0)
       timeout (~> 0.4)