Merge pull request gocd#10386 from gocd/dependabot/bundler/server/src/main/webapp/WEB-INF/rails/regexp_parser-2.3.1

ui: bump regexp_parser from 2.3.0 to 2.3.1 in /server/src/main/webapp/WEB-INF/rails

Author: chadlwilson

server/src/main/webapp/WEB-INF/rails/Gemfile.lock

@@ -147,7 +147,7 @@ GEM
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    regexp_parser (2.3.0)
+    regexp_parser (2.3.1)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)