ruby:2.7 security update

ruby 2.7.4-137 - Upgrade to Ruby 2.7.4. - Fix command injection vulnerability in RDoc. Resolves: rhbz1986768 - Fix FTP PASV command response can cause Net::FTP to connect to arbitrary host. Resolves: rhbz1986812 - Fix StartTLS stripping vulnerability in Net::IMAP. Resolves: rhbz1986813 - Upgrade ...