Bump master minimum pg to the latest

Followup to #21953

Gemfile

@@ -59,7 +59,7 @@ gem "net-ldap",                         "~>0.16.1",          :require => false
 gem "net-ping",                         "~>1.7.4",           :require => false
 gem "openscap",                         "~>0.4.8",           :require => false
 gem "optimist",                         "~>3.0",             :require => false
-gem "pg",                               ">=1.3", "!= 1.4.0", :require => false # 1.4.0 caused https://github.com/ged/ruby-pg/issues/466
+gem "pg",                               ">=1.4.1",           :require => false
 gem "pg-dsn_parser",                    "~>0.1.0",           :require => false
 gem "query_relation",                   "~>0.1.0",           :require => false
 gem "rack",                             ">=2.2.3.1",         :require => false