feat(gems): update to pact-mock_service 2.5.1

Author: bethesque

packaging/Gemfile.lock

@@ -24,7 +24,7 @@ GEM
       term-ansicolor (~> 1.0)
       thor
       webrick
-    pact-mock_service (2.4.0)
+    pact-mock_service (2.5.1)
       filelock (~> 1.1)
       find_a_port (~> 1.0.1)
       json