Revert "feat: bind to IPv6 'any' as well as IPv4 'any' (#170)"

This reverts commit 992aa59.

Author: YOU54F

pact_broker/config/puma.rb

@@ -1,7 +1,6 @@
 require_relative "../docker_configuration"
 
-bind "tcp://0.0.0.0:#{PactBroker.docker_configuration.port}"
-bind "tcp://[::]:#{PactBroker.docker_configuration.port}"
+port PactBroker.docker_configuration.port
 
 if PactBroker.docker_configuration.puma_persistent_timeout
   persistent_timeout PactBroker.docker_configuration.puma_persistent_timeout