Update Pg to 1.4 (#37525).

Patch by Yuichi HARADA.


git-svn-id: https://svn.redmine.org/redmine/trunk@21750 e93f8b46-1217-0410-a6f0-8f06a7374b81

Gemfile

@@ -67,7 +67,7 @@ if File.exist?(database_file)
       when 'mysql2'
         gem "mysql2", "~> 0.5.0", :platforms => [:mri, :mingw, :x64_mingw]
       when /postgresql/
-        gem "pg", "~> 1.2.2", :platforms => [:mri, :mingw, :x64_mingw]
+        gem "pg", "~> 1.4.2", :platforms => [:mri, :mingw, :x64_mingw]
       when /sqlite3/
         gem "sqlite3", "~> 1.4.0", :platforms => [:mri, :mingw, :x64_mingw]
       when /sqlserver/