Update to 7.23.

• Added max_request_size attribute to Mojolicious.
• Added max_response_size attribute to Mojo::UserAgent.
• Added to_unsafe_string method to Mojo::URL.
• Added -S option to get command.
• Fixed a data corruption problem in Mojo::IOLoop::Stream, caused by a dependency of IO::Socket::SSL on the internal representation of strings, which differs from IO::Socket::IP.